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
CYP 3A4 enzymes are affected by: 
Select and explain. 
A. Fexofenadine, B. Phenytoin, C. Carbamazapine, D. Azithromycin
C: Carbamazapine
Answer: C: Carbamazapine 
Explanation: carbamezepine is metabolised by cyp3a4 enzyme inducers will enhance the metabolism of other drugs eg for enzyme inducers- phenytoin, phenobarbitone, carbamazepine, chronic alcoholism, smoking, st johns wa Pg.no 23 KD TRIPATHI Seventh edition