This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
[{'content': 'Which of the following drug is not metabolized by acetylation? \nSelect and explain. \nA. Isoniazid, B. Hydralazine, C. Phenytoin, D. Procainamide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Metabolism by acetylation: Two types of individuals are found, slow and fast acetylators. -Acetylation is done by N acetyl transferase enzyme. Drugs metabolised by acetylation *Sulfonamide* Hydralazine* Isoniazid* Procainamide These drugs can cause SLE.', 'role': 'assistant'}]