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
Which of the following inhibits CYP-P450 
Select and explain. 
A. grape fruit, B. Ethanol, C. Rifampicin, D. Procainamide
A: grape fruit
Answer: A: grape fruit 
Explanation: enzyme inhibitors- cimetidine, chloramphenicol, ciprofloxacin, ketoconazole, protease inhibitors like ritonavir, indinavir, saquinavir, and grape fruit juice etc Ref KD Tripathi 8th ed