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: Surgery
[{'content': 'Cisterna chyli lies in front of vertebrae \nSelect and explain. \nA. T11 and T12, B. T12 and L1, C. L1 and L2, D. L2 and L3', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cisterna chyli is a lymph sac lying in front of L1 and L2 vertebrae between aorta and crus of diaphragm.', 'role': 'assistant'}]