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
GABA-B receptors are - 
Select and explain. 
A. G-protein coupled receptors, B. Intrinsic ion channel, C. Enzyme linked receptors, D. Ligand gated ion channels
A: G-protein coupled receptors
Answer: A: G-protein coupled receptors 
Explanation: Ans: A. G-protein coupled receptors(Ref : KDT //e p. 399, 402 6 6h/e p. 395; Katzung 17th/e p' 377-378; lP/e p' 355)GABA-A receptors:Intrinsic Cl- channets and when open cause increase in CI- conductance and CNS depression.GABA-B receptors:G-protein coupled receptors.Baclofen is agonist and saclofen is antagonist on these receptors.