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 the benzodiazepine receptor is: 
Select and explain. 
A. Phenobarbitone., B. Flumazenil., C. Beta carboline., D. Gabapentin.
C: Beta carboline.
Answer: C: Beta carboline. 
Explanation: None