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
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 inhibits oxidation of certain drugs like diazepam, phenytoin and warfarin levels may be increased. Clarithromycin inhibits omeprazole metabolism and increases its plasma concentration.