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
Duration of action of flumazenil : 
Select and explain. 
A. 10 minutes, B. 20 minutes, C. 30 minutes, D. 40 minutes
D: 40 minutes
Answer: D: 40 minutes 
Explanation: Ans. d. 40 minutes `On IV injection, action of flumazenil stas in seconds and lasts for 1-2 hours; elimination t-half is 1 hour, due to rapid metabolism.'