This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gluteal Region, Subject name: Anatomy
[{'content': 'Structure which passes through both greater and lesser sciatic foramen? \nSelect and explain. \nA. Nerve to quadrates femoris, B. Superior gluteal nerve, C. Nerve to obturator internus, D. Piriformis muscle', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) Nerve to obturator internusRef: Gray's Anatomy 40th ed., chapter 80", 'role': 'assistant'}]