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 endotracheal tube is inserted in: 
Select and explain. 
A. Right bronchus, B. Left bronchus, C. Trachea, D. in laryngopharynx
C: Trachea
Answer: C: Trachea 
Explanation: None