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: Pathology
[{'content': "Noma is \nSelect and explain. \nA. pyogenic granuloma, B. fibrous dysplasia, C. Vincent's disease, D. cancrum oris", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]