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': 'Arch of aoa lies at what veebral level \nSelect and explain. \nA. T5, B. T4, C. T6, D. T2', 'role': 'user'}, {'content': "Answer: B \nExplanation: Arch of aoa stas and ends at same level that is lower border of fouh thoracic veebrae. BD CHAURASIA'S HUMAN ANATOMY.VOLUME 1. 6TH EDITION.Page no-275", 'role': 'assistant'}]