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
[{'content': 'Most common site for parasinus cancer is ? \nSelect and explain. \nA. Maxillary sinus, B. Frontal sinus, C. Ethmoidal sinus, D. Equal distribution in all sinuses', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Maxillary sinus is the most common site.\nUsually its SCC. Treatment is excision plus radiotherapy.', 'role': 'assistant'}]