This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which drug is not metabolised by acetylation? 
Select and explain. 
A. INH, B. Dapsone, C. Hydralazine, D. Metoclopramide
C: Hydralazine
Answer: C: Hydralazine 
Explanation: Acetylation is a phase II metabolic reaction. Drugs metabolized by acetylation are Sulfonamides, Hydralazine, Isoniazid, Procainamide. Individuals who are slow acetylators are predisposed to drug-induced autoimmune disorders. Ref: K.D.T 6th Ed Page 25