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
Most potent proton pump inhibitor is 
Select and explain. 
A. Omeprazole, B. Rabeprazole, C. Esomeprazole, D. Lansoprazole
D: Lansoprazole
Answer: D: Lansoprazole 
Explanation: Lansoprazole is the most potent proton pump inhibitor.