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': 'Which of thefollowing is NOT true about nasopharyngeal carcinoma? \nSelect and explain. \nA. Bimodal age distribution, B. EBV is implicated as etiological agent, C. Squamous cell carcinoma is common, D. Nasopharyngectomy and lymph node dissection is mainstay of treatment', 'role': 'user'}, {'content': 'Answer: D \nExplanation: In nasopharyngeal carcinoma, radiotherapy is the mainstay of treatment. Radical neck dissection is required for persistent nodes when primary has been controlled.', 'role': 'assistant'}]