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': 'Nicotine receptor sites include all of the following except- \nSelect and explain. \nA. Bronchial smooth muscle, B. Adrenal medulla, C. Skeletal muscle, D. Sympathetic ganglia', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Bronchial smooth muscle Smooth muscles have muscarinic receptors (M3 type).", 'role': 'assistant'}]