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
Structure which passes through both greater and lesser sciatic foramen? 
Select and explain. 
A. Nerve to quadrates femoris, B. Superior gluteal nerve, C. Nerve to obturator internus, D. Piriformis muscle
C: Nerve to obturator internus
Answer: C: Nerve to obturator internus 
Explanation: Ans. (c) Nerve to obturator internusRef: Gray's Anatomy 40th ed., chapter 80