This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
[{'content': 'Treatment of choice for T2 carcinoma of nasopharynx is \nSelect and explain. \nA. Surgery, B. Radiotherapy, C. Chemotherapy, D. Surgery and postoperative radiotherapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiotherapy is the treatment of choice for nasopharyngeal cancer. Stage I and II are treated by radiotherapy alone while stage III and IV require concomitant radiation and chemotherapy or radiation followed by chemotherapy. External beam radiation of 6000-7000 cGy can be delivered by the linear accelerator to the primary and both sides of the neck. More advanced techniques of radiotherapy such as three-dimensional conformal radiotherapy and intensity modulated radiotherapy (IM) are now being used more and more. (Ref: Diseases of Ear, Nose and Throat, P.L Dhingra, 7th edition, page 285)', 'role': 'assistant'}]