This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Norepinephrine is metabolized by which of the following enzymes \nSelect and explain. \nA. COMT, B. MAO, C. Both, D. Neither', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Both COMT and MAO breakdown norepinephrine. Ref:- KD Tripathi', 'role': 'assistant'}]