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
[{'content': 'Which of the following muscles has attachment on the capsule of hip joint? \nSelect and explain. \nA. Sartorius, B. Rectus femoris, C. Vastus lateralis, D. Vastus medialis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Posterior head of rectus femoris arises from a groove above the acetabulum and the capsule of hip joint.', 'role': 'assistant'}]