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
Subarachnoid space ends at - 
Select and explain. 
A. D12, B. L2, C. L5, D. S2
D: S2
Answer: D: S2 
Explanation: The dura and arachnoid along with subarachoid space containing CSF extend upto 2nd sacral vertebra.