This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'The following receptor has an intrinsic ion channel \nSelect and explain. \nA. Histamine H1 receptor, B. Histamine H2 receptor, C. Adrenergic alfa receptor, D. GABA-benzodiazepine receptor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: GABA -BDZ receptor is an ion channel receptor , has an intrinsic Cl ion channel opening when a agonist binds to it and causes increase in frequency of channel opening and causes hyperpolarization. KDT 6/ e pg 42', 'role': 'assistant'}]