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
Isthmus of thyroid gland lies at which level? 
Select and explain. 
A. C2, B. C4, C. C5, D. C7
D: C7
Answer: D: C7 
Explanation: Isthmus of thyroid gland lies at C7 level