This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Methacolamine has maximum agonists action at which of the following cholinergic receptors \nSelect and explain. \nA. M1, B. M2, C. M3, D. M4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Katzung 12e p100 KDT 7/e p101 Methacolamine is a non selective muscarine agonists. It has maximum agonist action on M2 receptors. relative selective agonist of cholinergic receptors are: M1 selective -Oxatremorine M2 selective -Methacolamine M3 selective- bethanocol', 'role': 'assistant'}]