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
Lower border of pharynx is the level of: 
Select and explain. 
A. C2, B. C3, C. C4, D. C6
D: C6
Answer: D: C6 
Explanation: Pharynx, the upper portion of gut tube, is funnel-shaped fibromuscular tube that extends from the base of the skull to the inferior border of the cricoid cartilage at the level of C6 vertebra. 
It continues inferiorly as the esophagus.