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 BZD 
Select and explain. 
A. Beta-carboline, B. Bicuculine, C. Baclofen, D. Diazepam
A: Beta-carboline
Answer: A: Beta-carboline 
Explanation: beta carboline is an inverse agonist of BDZ .