[2025-10-01T03:31:19.460171] [QUERYOME] Starting research for query 1124: 'Instructions: 
 Answer the question below. First, respond with the single best option letter (A, B, C, or D). Then provide a concise reasoning (1–3 sentences). Use both the retrieved evidence and your own medical knowledge to choose the most accurate answer. 

Question:
Which of the following is not true for myelinated nerve fibers: 

Options:
{'A': 'Impulse through myelinated fibers is slower than non-myelinated fibers', 'B': 'Membrane currents are generated at nodes of Ranvier', 'C': 'Saltatory conduction of impulses is seen', 'D': 'Local anesthesia is effective only when the nerve is not covered by myelin sheath'}'
[2025-10-01T03:31:19.519881] [PI] Starting research for query: 'Instructions: 
 Answer the question below. First, respond with the single best option letter (A, B, C, or D). Then provide a concise reasoning (1–3 sentences). Use both the retrieved evidence and your own medical knowledge to choose the most accurate answer. 

Question:
Which of the following is not true for myelinated nerve fibers: 

Options:
{'A': 'Impulse through myelinated fibers is slower than non-myelinated fibers', 'B': 'Membrane currents are generated at nodes of Ranvier', 'C': 'Saltatory conduction of impulses is seen', 'D': 'Local anesthesia is effective only when the nerve is not covered by myelin sheath'}'
[2025-10-01T03:31:19.521880] Saving text to bench_final/run1/medmcqa/medmcqa_1123/pi_initial_prompt.txt
[2025-10-01T03:31:19.543200] [PI] Calling o3 for initial analysis...
[2025-10-01T03:31:32.365689] [PI] Reasoning iteration 1
[2025-10-01T03:31:32.367626] [PI reasoning] **Evaluating nerve fiber options**

I need to analyze an MCQ about myelinated nerve fibers. Option A states that impulses in myelinated fibers are slower than in non-myelinated fibers, which is false because they're faster. Option B and C are true: they refer to currents at the nodes of Ranvier and saltatory conduction, respectively. Option D claims that local anesthetics are effective only when nerves are not covered by myelin, which misleads, as they work at the nodes. So, A and D both aren't true, but I think only A is clearly false.
[2025-10-01T03:31:32.370435] [PI] Executing function call 1: hybrid_search
[2025-10-01T03:31:32.372549] [PI] Function arguments: {'query': 'conduction velocity myelinated versus unmyelinated nerve impulse faster', 'k': 5, 'faiss_weight': 0.7, 'bm25_weight': 0.3, 'use_rrf': True}
[2025-10-01T03:31:32.375870] Saving JSON to bench_final/run1/medmcqa/medmcqa_1123/pi_iteration_1_tool_call_2_hybrid_search.json
[2025-10-01T03:32:10.518582] [PI] Function hybrid_search executed successfully
[2025-10-01T03:32:10.520586] Saving JSON to bench_final/run1/medmcqa/medmcqa_1123/pi_iteration_1_tool_result_2_hybrid_search.json
[2025-10-01T03:32:10.530799] [PI] Continuing reasoning with 1 function responses...
[2025-10-01T03:32:13.470430] [PI] Reasoning iteration 2
[2025-10-01T03:32:13.472830] [PI] Executing function call 1: hybrid_search
[2025-10-01T03:32:13.474957] [PI] Function arguments: {'query': 'local anesthetic block myelinated nerve nodes of Ranvier three successive nodes', 'k': 5, 'faiss_weight': 0.7, 'bm25_weight': 0.3, 'use_rrf': True}
[2025-10-01T03:32:13.476633] Saving JSON to bench_final/run1/medmcqa/medmcqa_1123/pi_iteration_2_tool_call_2_hybrid_search.json
[2025-10-01T03:32:32.478568] [PI] Function hybrid_search executed successfully
[2025-10-01T03:32:32.480783] Saving JSON to bench_final/run1/medmcqa/medmcqa_1123/pi_iteration_2_tool_result_2_hybrid_search.json
[2025-10-01T03:32:32.485995] [PI] Continuing reasoning with 1 function responses...
[2025-10-01T03:32:47.204821] [PI] Reasoning iteration 3
[2025-10-01T03:32:47.206546] [PI reasoning] **Analyzing citations and options**

I need supporting citations for conduction speed and local anesthetic nodes. The first citation states that nerve impulses along myelinated axons can be up to 300 times faster than unmyelinated ones. For local anesthetics, I need to show that they can block myelinated fibers as well. Options to consult include studies on local anesthetic effects on myelinated fibers. Now, let's analyze the given options. Option D states that local anesthesia only works on nonmyelinated nerves, which I suspect is incorrect.
[2025-10-01T03:32:47.218632] [PI] No function calls found in response
[2025-10-01T03:32:47.221264] [PI] No more function calls - research complete
[2025-10-01T03:32:47.223048] Saving text to bench_final/run1/medmcqa/medmcqa_1123/pi_final_answer.txt
[2025-10-01T03:32:47.228219] [QUERYOME] Query completed successfully
