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': 'Thoracic duct crosses at \nSelect and explain. \nA. T1, B. C7, C. T5, D. T8', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In the neck thoracic duct arches laterally at the level of C7 <img src=" /> B D CHAURASIA\'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME-1 SIXTH EDITION Page no-285', 'role': 'assistant'}]