This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, 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: Flumazenil is competitive BZD - antagonist ,while dimethoxyethyl-carbomethoxy-b caboline (DMCM) which is a BZD inverse agonist inhibits GABA action & are rare convulsant. Ref: KD Tripathi 8th ed.