This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Sympathetic stimulation on the bronchus causes 
Select and explain. 
A. Bronchial dilatation, B. Bronchial constriction, C. Increased secretion of glands into bronchi, D. No effect
A: Bronchial dilatation
Answer: A: Bronchial dilatation 
Explanation: (A) Bronchial dilatation