This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
Which of the following is not an inducer of CYP3A4 
Select and explain. 
A. Barbiturates, B. Glucocoicoids, C. Phenytoin, D. Erythromycin
D: Erythromycin
Answer: D: Erythromycin 
Explanation: Inducer of CYP3A4 areBarbiturates,carbamazepine,glucocoicoids,pioglitazone, phenytoin,rifampin, St. John's wo