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
Nicotinic receptor sites include all of the following except: 
Select and explain. 
A. Bronchial smooth muscle, B. Adrenal medulla, C. Skeletal muscle, D. Sympathetic ganglia
A: Bronchial smooth muscle
Answer: A: Bronchial smooth muscle 
Explanation: None