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
Nerve entrapped in pyriformis syndrome is 
Select and explain. 
A. Superior gluteal nerve, B. Inferior gluteal nerve, C. Pudendal nerve, D. Sciatic nerve
D: Sciatic nerve
Answer: D: Sciatic nerve 
Explanation: Entrapment of Sciatic nerve by inflamed pyriformis muscle is called as pyriformis syndrome.