A

Flumazenil is a specific competitive antagonist at central benzodiazepine receptors and is used to reverse benzodiazepine sedation or overdose, whereas the other listed drugs are unrelated to benzodiazepine receptors (furazolidone is an antimicrobial; naloxone and naltrexone are opioid antagonists) [Longmire & Seger, 1993, PMID 8101045].