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
Which drug is not metabolized by acetylation? 
Select and explain. 
A. Isoniazid, B. Dapsone, C. Hydralazine, D. Metoclopropamide
D: Metoclopropamide
Answer: D: Metoclopropamide 
Explanation: Ans. (D) Metoclopropamide(Ref: KDT 8th/ep76)Important drugs metabolized by acetylation areS - Sulfonamides including dapsoneH - HydralazineI - IsoniazidP - Procainamide