This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs for Peptic Ulcer, Subject name: Pharmacology
[{'content': 'The most efficacious drug for inhibiting round the clock gastric acid output is: \nSelect and explain. \nA. Omeprazole, B. Cimetidine, C. Pirenzepine, D. Misoprostol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: -PPI like omeprazole are strongest acid inhibitors. -PPI are drug of choice for peptic ulcer.', 'role': 'assistant'}]