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
[{'content': 'CYP–450 inducers are: \nSelect and explain. \nA. Cimetidine, B. Ketoconazole, C. Phenobarbitone, D. Theophylline', 'role': 'user'}, {'content': 'Answer: C \nExplanation: -\xa0P450 inducers\n\n\xa0 \xa0Phenobarbitone\n\xa0 \xa0Rifampicin\n\xa0 \xa0Phenytoin\n\xa0 \xa0Chloral hydrate\n\xa0 \xa0Griseofulvin\n\xa0 \xa0Phenylbutazone\n\xa0 \xa0DDT\n\xa0 \xa0Chronic alcohol ingestion\n\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Cimetidine and Ketoconazole inhibits metabolizing enzymes.', 'role': 'assistant'}]