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
[{'content': 'Common carotid artery is palpable at: \nSelect and explain. \nA. Upper border of thyroid cartilage, B. Upper border of cricoid cartilage, C. At hyoid bone, D. Lower border of cricoid cartilage', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Common carotid: It is a branch of brachiocephalic trunk on right side and a direct branch of arch of aorta on the left side. The artery runs upwards along medial border of stemocleidomastoid muscle enclosed within the carotid sheath. The artery ends by dividing into internal carotid and external carotid at the upper border of thyroid cartilage.\nThe anterior\xa0tubercle of the transverse\xa0 process of the sixth cervical vertebra is the largest\xa0of all suchprocesses and is called the carotid tubercle of Chassaignac.\xa0The common\xa0carotid\xa0artery\xa0can be best pressed against this tubercle, deep to the anterior border of the sternocleidomastoid muscle.\nKey Concept:\nUpper border of thyroid cartilage lies at C3-4 vertebral level. Common carotid artery bifurcates into two branches at this level.\nReference: B D Chaurasia’s Head and Neck anatomy, 6th ed page no 79', 'role': 'assistant'}]