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
Ohngren's classification is used for - 
Select and explain. 
A. Maxillary' carcinoma, B. Mandibular carcinoma, C. Buccal carcinoma, D. Tongue carcinoma
A: Maxillary' carcinoma
Answer: A: Maxillary' carcinoma 
Explanation: Ans. is 'a' i.e., Maxillary carcinoma