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 lower border of: 
Select and explain. 
A. T1, B. T2, C. T3, D. T4
D: T4
Answer: D: T4 
Explanation: Ans. D i.e. T4