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
Upper border of thyroid cartilage is at - 
Select and explain. 
A. C2, B. C4, C. C6, D. Tl
B: C4
Answer: B: C4 
Explanation: Thyroid cartilage, itself lies in front of C4 - C5 level. Its upper border is at C4 vertebra level.

"The superior border of the thyroid cartilage is at the C4 level." — Atlas of anatomy