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 adults, the spinal cord normal ends at: \nSelect and explain. \nA. Lower border of L1, B. Lower border of L3, C. Lower border of S1, D. Lower border of L5', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]