Best option: D

Reasoning: WHO criteria for severe falciparum malaria include hypoglycaemia (<40 mg/dL) and renal failure (serum creatinine > 3 mg/dL); low—not high—hematocrit (<15 %) is used to define severe anaemia, and lactate dehydrogenase is not part of the standard criteria. Therefore “hematocrit more than 15” is not a recognised marker of severe malaria [Weber 1998, PMID 9772325].