This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Common carotid aery bifurcation is at 
Select and explain. 
A. Thyroid cailage, B. Cricord cailage, C. C7, D. T2
A: Thyroid cailage
Answer: A: Thyroid cailage 
Explanation: At the level of the upper border of the thyroid cailage, the aery ends by dividing into the external and internal carotid aeries. The right common carotid aery is a branch of the brachiocephalic aery. The left common carotid aery is branch of the arch of the aoa. Ref: BDC volume 3;sixth edition: pg 99