This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, larynx and trachea and cranial nerves 3,4,6, Subject name: Anatomy
[{'content': 'Common carotid bifurcates at which border of thyroid cailage? \nSelect and explain. \nA. Superior, B. Inferior, C. Lateral, D. Medial', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Common carotid aery bifurcates at superior border of lamina of thyroid cailage of larynx at C3 veebral level. At lower border of C6 , ending of larynx and pharynx and beginning of trachea and oesophagus.', 'role': 'assistant'}]