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': 'Nicotinic 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: None', 'role': 'assistant'}]