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': 'In an adult, the spinal cord ends at: \nSelect and explain. \nA. T12-L1, B. L1-L2, C. L3-L4, D. Si-S2', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Li - L2', 'role': 'assistant'}]