This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
CYP 450 inducers are 
Select and explain. 
A. Cimetidine, B. Ketokonazole, C. Phenobarbitone, D. Theoplylline
C: Phenobarbitone
Answer: C: Phenobarbitone 
Explanation: P-450 inducers are: Phenobarbitone, rifampicin, phenytoin, chloe hydrate, phenylbutazone, griseofulvin, DDT, an chronic alcohol ingestion. Ketoconazole and cimetidine inhibit the drug metabolizing enzymes. Ref-KDT 7/e p26