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': 'Root value of sciatic nerve - \nSelect and explain. \nA. S1S2S3, B. L4L5S1S2S3, C. L1L2L3, D. L2L3L4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sciatic nerve- L4,5 S1,2,3', 'role': 'assistant'}]