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
Drugs undergoing acetylation include all except: 
Select and explain. 
A. Dapsone, B. Metoclopramide, C. Procainamide, D. INH
B: Metoclopramide
Answer: B: Metoclopramide 
Explanation: Ans. B. MetoclopramideAcetylation by N-acetyl transferases (NAT)e.g, S - SulfonamidesH - HydralazineI - IsoniazidP - Procainamide, PASD - DapsoneC - Clonazepam, Caffeine