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: 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 In head and neck cancer, Ohngren's line is a line that connects the medial canthus of the eye to the angle of the mandible. The line defines a plane ohogonal to a sagittal plane that divides the maxillary sinus into (1) an anterior-inferior pa, and (2) a superior-posterior pa. Tumours that arise in the anterior-inferior pa, i.e. below Ohngren's line, generally have a better prognosis than those in the other group. Addition to above a veical line through pupil is also considered, which divides the above-mentioned structures into 4 different regions. The structures at posterosuperior medial have worst prognosis and that at anteroinferior medial are least dangerous.", 'role': 'assistant'}]