This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Bifurcation of trachea is at 
Select and explain. 
A. Upper border of T5, B. Lower border of T4, C. Upper border of T4, D. Lower border of T5
B: Lower border of T4
Answer: B: Lower border of T4 
Explanation: Trachea bifurcates at the lower border of fouh thoracic veebrae. <img src=" /> BA CHAURASIA'S HUMAN ANATOMY VOLUME 1. 6TH EDITION.page no-280