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: ENT
[{'content': 'Most common malignancy in maxillary antrum is - \nSelect and explain. \nA. Muco-epidermoid Carcinoma, B. Adeno cystic Ca, C. Adenocarcinoma, D. Squamous cell Ca', 'role': 'user'}, {'content': 'Answer: D \nExplanation: More than 80% of the malignant tumors of paransal sinus and of nose are of squamous cell variety. Rest are Adenocarcinoma, Adenoid cystic carcinoma, Melanoma and various types of sarcomas.\nMaxillary sinus is the most frequently involved sinus. Other sites in decreasing order are nasal cavity, ethmoid sinuses, frontal and sphenoid sinus.', 'role': 'assistant'}]