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
Most common cytochrome associated with metabolism of drugs is ? 
Select and explain. 
A. CYP3A4/5, B. CYP2D6, C. CYP2C8/9, D. CYP2Cl.9
A: CYP3A4/5
Answer: A: CYP3A4/5 
Explanation: Ans. is 'a' i.e., CYP3A4/5 Cyp 3 A 4/5 carryout biotransformation of largest number (nearly 50%) of drugs.