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': 'Commando operation is used as treatment for \nSelect and explain. \nA. Colon cancer, B. Carcinoma esophagus, C. Parotid gland tumour, D. Carcinoma of oral cavity', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]