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 proton pump inhibitor has enzyme inhibitory activity? 
Select and explain. 
A. Rabeprazole, B. Lansoprazole, C. Pantoprazole, D. Omeprazole
D: Omeprazole
Answer: D: Omeprazole 
Explanation: Omeprazole and esomoprazole are microsomal anzymes inhibitors .these may decrease the metabolism of diazepam. Lansoprazole enhances the metabolism of theophyllin .(katzung 11/e p1075)