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
All of them use tonsillectomy as important step except 
Select and explain. 
A. Transection of Glossopharyngeal nerve, B. Eagle's syndrom, C. In Treating sleep apnoea, D. Transection of vagus Nerve
D: Transection of vagus Nerve
Answer: D: Transection of vagus Nerve 
Explanation: None