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: Surgery
Most common site for parasinus cancer is ? 
Select and explain. 
A. Maxillary sinus, B. Frontal sinus, C. Ethmoidal sinus, D. Equal distribution in all sinuses
A: Maxillary sinus
Answer: A: Maxillary sinus 
Explanation: Maxillary sinus is the most common site.
Usually its SCC. Treatment is excision plus radiotherapy.