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': 'Lower border of pharynx is the level of: \nSelect and explain. \nA. C2, B. C3, C. C4, D. C6', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Pharynx, the upper portion of gut tube, is funnel-shaped fibromuscular tube that extends from the base of the skull to the inferior\xa0border of the cricoid cartilage at the level of C6 vertebra.\xa0\nIt continues inferiorly as the esophagus.', 'role': 'assistant'}]