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
[{'content': 'Most potent proton pump inhibitor is \nSelect and explain. \nA. Omeprazole, B. Rabeprazole, C. Esomeprazole, D. Lansoprazole', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Lansoprazole is the most potent proton pump inhibitor.', 'role': 'assistant'}]