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: Surgery
An 8-month-old infant had stridor with respiratory difficulty which worsened on crying. On examination, laryngoscopy showed a red mass in the subglottic area. All the following are used in the treatment EXCEPT 
Select and explain. 
A. CO 2 laser vaporization, B. Coicosteroids, C. Tracheostomy, D. Radiotherapy
D: Radiotherapy
Answer: D: Radiotherapy 
Explanation: History and examination suggest diagnosis is juvenile papilloma - They are viral in origin and multiple, often involving infants and young children. * They are mostly seen on the true and false cords and the epiglottis, glistening white, irregular growth, pedunculated * Or sessile, friable and bleeding easily