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
The mitochondrial enzyme involved in the metabolism of clopidogrel and proton pump inhibitors is: 
Select and explain. 
A. CYP3A4, B. CYP2D6, C. CYP 2C19, D. CYP 2C9
C: CYP 2C19
Answer: C: CYP 2C19 
Explanation: 50% of drugs are metabolized bycyp3a4 20-30% by cyp2d6 cyp2c19-omeprazole, clopidogrel, diazepam, citalopram, etc KD Tripathi 8th ed