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
Ohngren's classification is used for 
Select and explain. 
A. Ca maxillary sinus, B. Ca nasopharynx, C. Ca oropharynx, D. Ca tongue
A: Ca maxillary sinus
Answer: A: Ca maxillary sinus 
Explanation: 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