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
[{'content': 'Common carotid aery bifurcation is at \nSelect and explain. \nA. Thyroid cailage, B. Cricord cailage, C. C7, D. T2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]