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 causes \nSelect and explain. \nA. Pupillary constriction, B. Contraction of bladder detrusor, C. Bronchial smooth muscle contraction, D. Vasoconstriction of skin and mucus membranes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sympathetic stimulation causes vasoconstriction in all blood vessels except those in skeletal muscles. And causes pupillary dilatation, bronchial smooth muscle dilation, relaxation of detrussor muscle of bladder Ref: Ganong&;s review of medical physiology; 23rd edition; pg:556', 'role': 'assistant'}]