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: Medicine
[{'content': 'All of the following drugs are used for eradication of Helcobacter pylori except - \nSelect and explain. \nA. Bismuth subcitrate, B. Sucralfate, C. Metronidazole, D. moxycillin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]