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
Which of the following muscles has attachment on the capsule of hip joint? 
Select and explain. 
A. Sartorius, B. Rectus femoris, C. Vastus lateralis, D. Vastus medialis
B: Rectus femoris
Answer: B: Rectus femoris 
Explanation: Posterior head of rectus femoris arises from a groove above the acetabulum and the capsule of hip joint.