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
Action of flumazenil on benzodiazepine receptor is : 
Select and explain. 
A. Agonist, B. Partial agonist, C. Inverse agonist, D. Antagonist
D: Antagonist
Answer: D: Antagonist 
Explanation: None