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': 'Fastest acting proton pump inhibitor is \nSelect and explain. \nA. Rabeprazole, B. Lansoprazole, C. Tenatoprazole, D. Esomeprazole', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rabeprazole is the fastest acting proton pump inhibitor.', 'role': 'assistant'}]