This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerves of Lower Extremity, Subject name: Anatomy
[{'content': 'Root value for nerve to Quadratus femoris - \nSelect and explain. \nA. L1L2 L3, B. L2 L3 L4, C. L4 L5 S1, D. S1 S2 S3', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., L4 L5 S1o Nerve to quadratus femoris is a branch of sacral plexus with root value L4 L5 S\\.Sacral plexus has been explained in previous sessions.", 'role': 'assistant'}]