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: Anatomy
Bifurcation of Trachea is at the level of 
Select and explain. 
A. Body of T6, B. Lower border of T6, C. Body of T4, D. Lower border of T4
A: Body of T6
Answer: A: Body of T6 
Explanation: Bifurcation of Trachea is at the level of Body of T6