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
[{'content': 'Sympathetic stimulation on the bronchus causes \nSelect and explain. \nA. Bronchial dilatation, B. Bronchial constriction, C. Increased secretion of glands into bronchi, D. No effect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Bronchial dilatation', 'role': 'assistant'}]