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
Benzodiazepine binding ste on GABA receptors is on ? 
Select and explain. 
A. y-subunit, B. a-subunit, C. b-subunit, D. d-subunit
B: a-subunit
Answer: B: a-subunit 
Explanation: Ans. is'b'i.e., a-subunitThe exact subunit structures of native GABA receptors are still are unknown, but it is thought that most GABA receptor are composed of alpha, beta & gamma subunits that Coassemble with some unceain stoichiometry.Binding site of GABA is on beta-subunit.Benzodiazepine site is located on the a subunit but the stabilization or completion of that site in the assembled. Structure also requires the y subunit.