This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Pharmacology
Flumazenilis 
Select and explain. 
A. Benzodiazepine antagonist, B. Benzodiazepine agonist, C. Melatonin receptor agonist, D. GABA analogue
A: Benzodiazepine antagonist
Answer: A: Benzodiazepine antagonist 
Explanation: (Benzodiazepine antagonist) (399-KDT6th)* Flumazenil - Benzodiazepine antagonistUses - (i) To reverse BZD anaesthesia (ii) BZD overdose* Melatonin receptor agonist - Ramelteon