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
Esophagus stas at the level of 
Select and explain. 
A. Upper border of cricoid cailage, B. Lower border of cricoid cailage, C. Thyroid cailage, D. Hyoid cailage
B: Lower border of cricoid cailage
Answer: B: Lower border of cricoid cailage 
Explanation: Esophagus begins in neck at lower border of cricoid cailage. BD CHAURASIA&;S HUMAN ANATOMY.VOLUME 1. 6TH EDITION.PAGE NO 282