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': 'Hemiazygous vein crosses left to right at the level of \nSelect and explain. \nA. T8, B. T10, C. T12, D. T6', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hemiazygos vein turns to the right at the level of T8 B D CHAURASIA&;S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME-1 SIXTH EDITION Page no-224', 'role': 'assistant'}]