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
[{'content': 'GABA-B receptors are - \nSelect and explain. \nA. G-protein coupled receptors, B. Intrinsic ion channel, C. Enzyme linked receptors, D. Ligand gated ion channels', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]