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': 'A patient presented with a 1X1.5 cms growth on the lateral border of the tongue. The treatment indicated would be:- \nSelect and explain. \nA. Laser ablation, B. Interstitial brachytherapy, C. External beam radiotherapy, D. Chemotherapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiation therapy may be curative in early cancer and may preserve maximal normal anatomy and function. Brachytherapy allows delivery of a large radiation boost to the primary tumor bed.', 'role': 'assistant'}]