This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: ENT
[{'content': "Ohngren's classification is used for - \nSelect and explain. \nA. Maxillary' carcinoma, B. Mandibular carcinoma, C. Buccal carcinoma, D. Tongue carcinoma", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Maxillary carcinoma", 'role': 'assistant'}]