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
Root value of sciatic nerve - 
Select and explain. 
A. S1S2S3, B. L4L5S1S2S3, C. L1L2L3, D. L2L3L4
B: L4L5S1S2S3
Answer: B: L4L5S1S2S3 
Explanation: Sciatic nerve- L4,5 S1,2,3