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: Medicine
[{'content': 'Prophylactic radiotherapy to neck given in which malignancy with palpable swelling - \nSelect and explain. \nA. Nasopharyngeal carcinoma, B. Laryngeal carcinoma, C. Sinuses malignancy, D. Tongue carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]