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': 'The following are the sites of ion channel cholinergic receptors except \nSelect and explain. \nA. Adrenal medulla, B. Bronchial muscle, C. Skeletal muscle, D. Ganglia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: NM, NN are ion channel receptors. bronchial muscle contains M3 receptors which are GPCR Ref: KDT 7th ed pg 101', 'role': 'assistant'}]