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 of the following are composite muscles except? 
Select and explain. 
A. Pectineus, B. Rectus femoris, C. Adductor magnus, D. Biceps femoris
B: Rectus femoris
Answer: B: Rectus femoris 
Explanation: None