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
The treatment of choice for stage I cancer larynx is- 
Select and explain. 
A. Radical surgery, B. Chemotherapy, C. Radiotherapy, D. Surgery followed by radiotherapy
C: Radiotherapy
Answer: C: Radiotherapy 
Explanation: Friends remember 2 very important concepts regarding laryngeal Ca:

If the site of larynx caner viz supra glottis, glottis or subglottis is not mentioned, the cancer should be considered glottic (since it is the M/C variety)
Generally stage I, II, III, IV means stage T1 , T2 , T3 , T4 respectively.

According to Dhingra

Radiotherapy is the treatment of choice for all stage I cancers of larynx, which neither impair mobility nor invade cartilage or cervical nodes. 
The greatest advantage of radiotherapy over surgery in Ca larynx glottic cancer is - preservation of voice.