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
Inverse agonist of benzodiazepine receptor is - 
Select and explain. 
A. Phenobarbitone, B. Flumazenil, C. Beta carboline, D. Gabapentin
C: Beta carboline
Answer: C: Beta carboline 
Explanation: Ans. is `c' i.e., Beta carboline