This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of Lower Limb, Subject name: Anatomy
[{'content': 'A 24-year-old woman presents to her physician with weakness in flexing the hip joint and extending the knee joint. Which muscle is most likely involved in this scenario? \nSelect and explain. \nA. Saorius, B. Gracilis, C. Rectus femoris, D. Vastus medialis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Rectus femoris flexes the thigh and extends the leg. The Saorius can flex both the hip and knee joints. The Gracilis adducts and flexes the thigh and flexes the leg The Vastus Medialis extends the knee joint.', 'role': 'assistant'}]