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': "Metronidazole is indicated in the treatment of which one of the following ? \nSelect and explain. \nA. Traveller's diarrhea, B. Escherichia coli-induced diarrhoea, C. Cryptosporidium-induced diarrhea, D. Helicobacter pylori infection", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]