This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroanatomy, Subject name: Anatomy
[{'content': 'What is the extent of spinal cord in an adult? \nSelect and explain. \nA. Lower border of L1, B. Tip of Coccyx, C. Upper border of L3, D. S2', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Lower border of LI * Spinal cord begins at foramen magnum and, in adults, ends at lower border of LI.StructureExtends uptoAdult spinal cordInfant spinal cordLower border of L} or upper border of L2Upper border of L3 vertebraeFilum terminalePiamaterTip of coccyxDural sheathSubdural spaceSub arachnoid spaceS2 vertebra", 'role': 'assistant'}]