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: Unknown
[{'content': 'In the newborn, the spinal cord ends at- \nSelect and explain. \nA. L3, B. S4, C. L5, D. LI', 'role': 'user'}, {'content': 'Answer: A \nExplanation: answer-A', 'role': 'assistant'}]