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
low tracheostomy is incision below 
Select and explain. 
A. 2nd Tracheal ring, B. 3rd Tracheal ring, C. 4th Tracheal ring, D. 1st Tracheal ring
C: 4th Tracheal ring
Answer: C: 4th Tracheal ring 
Explanation: None