This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
[{'content': 'Which drug is not metabolized by acetylation? \nSelect and explain. \nA. Isoniazid, B. Dapsone, C. Hydralazine, D. Metoclopropamide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (D) Metoclopropamide(Ref: KDT 8th/ep76)Important drugs metabolized by acetylation areS - Sulfonamides including dapsoneH - HydralazineI - IsoniazidP - Procainamide', 'role': 'assistant'}]