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
[{'content': 'Which of the following inhibits CYP-P450 \nSelect and explain. \nA. grape fruit, B. Ethanol, C. Rifampicin, D. Procainamide', 'role': 'user'}, {'content': 'Answer: A \nExplanation: enzyme inhibitors- cimetidine, chloramphenicol, ciprofloxacin, ketoconazole, protease inhibitors like ritonavir, indinavir, saquinavir, and grape fruit juice etc Ref KD Tripathi 8th ed', 'role': 'assistant'}]