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 all except \nSelect and explain. \nA. Positive chronotropy, B. Erection, C. Bronchodilatation, D. Vasoconstriction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Erection is due tovasodilatation which is a parasympathetic activity Ref: guyton and hall textbook of medical physiology 12 edition page number: 651,652,653', 'role': 'assistant'}]