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': 'Bifurcation of Trachea is at the level of \nSelect and explain. \nA. Body of T6, B. Lower border of T6, C. Body of T4, D. Lower border of T4', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bifurcation of Trachea is at the level of Body of T6', 'role': 'assistant'}]