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': 'The oesophgus commences at the following level? \nSelect and explain. \nA. Lower end of cricoid, B. C5 veebra, C. 10cm from incisor teeth, D. C7', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Lower end of Cricoid', 'role': 'assistant'}]