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: Physiology
[{'content': 'Receptors on cell membrane that activate ion channel after binding with agonists are: \nSelect and explain. \nA. Nicotinic cholinergic, B. Muscarinic cholinergic, C. Opioid mu receptors, D. GABA B receptors', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nicotinic\xa0cholinergic\xa0and\xa0GABAA are\xa0inotropic receptor (they are ion channel). Other receptors in the options are G\xad-protein coupled receptor; known as metabotropic receptor.', 'role': 'assistant'}]