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': 'Which of the following drug used in peptic ulcer can result in gynaecomastia \nSelect and explain. \nA. Sucralfate, B. Cimetidine, C. Pirenzepine, D. Rabeprazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cimetidine inhibits metabolism of estrogen and can cause gynaecomastia.', 'role': 'assistant'}]