This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'In adults, spinal cord normally ends at \nSelect and explain. \nA. Lower border of L1, B. Lower border of L3, C. Lower border of L5, D. Lower border of S1', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The spinal cord extends upto the level of 2nd lumbar veebra as conus medullaris.Below the level of conus medullaris only piamater is continued as a thin fibrous cord,the filum terminale. REF.BDC VOL.3 Fifth edition', 'role': 'assistant'}]