This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Flumazenil is - 
Select and explain. 
A. Diazepam inverse agonist, B. Diazepam antagonist, C. Opioid antagonist, D. Opioid inverse agonist
B: Diazepam antagonist
Answer: B: Diazepam antagonist 
Explanation: Ans. is 'b' i.e., Diazepam antagonist