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': '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: Tumor of lateral border of tongue T1 stage (< 2cm in size): Insterstitial irradiation or excision (paial glossectomy). T2 stage (> 2 cm) in size: External beam radiotherapy or hemiglossectomy', 'role': 'assistant'}]