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 GABA receptor is 
Select and explain. 
A. Benzodiazepines, B. Flumazenil, C. β- Carboline, D. None of the above
C: β- Carboline
Answer: C: β- Carboline 
Explanation: β - Carboline is the inverse agonist.
Benzodiazepines are full agonists that open chloride channels by acting on GABA receptors.
Flumazenil is antagonist for Benzodiazepines given to treat toxicity.