This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacokinetics, Subject name: Pharmacology
All are metabolized by acetylation, EXCEPT 
Select and explain. 
A. Hydralazine, B. INH, C. Procainamide, D. Chlorpromazine
D: Chlorpromazine
Answer: D: Chlorpromazine 
Explanation: Ans. is 'd' i.e., Chlorpromazine Drugs undergoing Acetylation-SulfonamidesIsoniazidPASHydralazineProcainamideAlso knowDrugs undergoing glucuronide conjugationChloramphenicolAspirinPhenacetinMorphineMetronidazoleDrugs undergoing Glycine conjugationSalicylates andOther drugs with Carboxyl groupDrugs undergoing Glutathione conjugationParacetamol