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 patient experiences paralysis of the muscle that originates from the femur and contributes directly to the stability of the knee joint.Which of the following muscles is involved? \nSelect and explain. \nA. Vastus lateralis, B. Semimembranosus, C. Saorius, D. Biceps femoris (long head)', 'role': 'user'}, {'content': 'Answer: A \nExplanation: All of them contribute to the stability of the knee joint but The vastus lateralis muscles arise from the femur and all the other muscles originate from the hip (coxal) bone.', 'role': 'assistant'}]