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
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: None