This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: ENT
[{'content': 'Oroantral fistula is caused by all the following except: \nSelect and explain. \nA. Dental extraction, B. Carcinoma of maxilla, C. Caldwell luc operation, D. Maxillectomy', 'role': 'user'}, {'content': "Answer: D \nExplanation: Oroantral fistula - there is a fistula between oral cavity and maxillary antrum. Causes 1. Dental procedure (extraction)2. Malignancy (because it can lead to perforation)3. Caldwell luc's operation In case of maxillectomy we remove maxilla antrum ,so the fistula will not be there.", 'role': 'assistant'}]