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
All are abductors of thigh, except: 
Select and explain. 
A. Gluteus medius, B. Gluteus minimus, C. Saorius, D. Piriformis
D: Piriformis
Answer: D: Piriformis 
Explanation: Piriformis