This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Esophagus stas at the level of \nSelect and explain. \nA. Upper border of cricoid cailage, B. Lower border of cricoid cailage, C. Thyroid cailage, D. Hyoid cailage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Esophagus begins in neck at lower border of cricoid cailage. BD CHAURASIA&;S HUMAN ANATOMY.VOLUME 1. 6TH EDITION.PAGE NO 282', 'role': 'assistant'}]