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
A patient presented with a 1X1.5 cms growth on the lateral border of the tongue. The treatment indicated would be:- 
Select and explain. 
A. Laser ablation, B. Interstitial brachytherapy, C. External beam radiotherapy, D. Chemotherapy
B: Interstitial brachytherapy
Answer: B: Interstitial brachytherapy 
Explanation: 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.