This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': "Ohngren's classification is used for \nSelect and explain. \nA. Ca maxillary sinus, B. Ca nasopharynx, C. Ca oropharynx, D. Ca tongue", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ohngren's classification: This is done using an imaginary line between medial canthus to the angle of mandible. Growth above this line have poor prognosis", 'role': 'assistant'}]