This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: Surgery
[{'content': 'Treatment for stage T3 N1 of carcinoma maxilla is: \nSelect and explain. \nA. Radiation therapy only, B. Chemotherapy only, C. Surgery and radiation, D. Chemotherapy and radiation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Surgery and radiationRef: Bailey 26/e p718Carcinoma of Sinuses:* MC sinus involved - Maxillary Sinus > Ethmoidal sinus* Maxillary tumors spread to Submandibular Nodes (Level 1)* Ethmoid tumors spread to Jugulo-digastric (Level 2) nodes* Sinus cancers are common in people working in Furniture industry, Nickel Industry and leather industry.* Exposure to Mustard causes Sinus cancers.* More than 80% are Squamous cancers.* Treatment of SCC Maxillary sinus - Combined Surgery + RT', 'role': 'assistant'}]