This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
All of the following drug is CYP3A inhibitor except: 
Select and explain. 
A. Erythromycin, B. Itraconazole, C. Ritonavir, D. Saquinavir
D: Saquinavir
Answer: D: Saquinavir 
Explanation: Ans. D. SaquinavirOut of all protease inhibitors, Saquinavir has least effect on hepatic microsomal enzymes. Rest of the protease inhibitors inhibit microsomal enzymesImportant enzymes inhibitors:a. Acute alcohol intakeb. Sodium valproatec. Cimetidine, Ketoconazole, Erythromycind. Grape fruit juicee. Protease inhibitors (Pls)f. Fluoroquinolonesg. Omeprazole