This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
[{'content': 'Lateral dislocation of patella is prevented by \nSelect and explain. \nA. Rectus femoris, B. Vastus medialis, C. Vastus lateralis, D. Vastus intermedius', 'role': 'user'}, {'content': "Answer: B \nExplanation: The lateral border provides inseion to vastus lateralis in its upper one-third or half. The medial border provides inseion to the vastus medialis in its upper two-thirds or more. Ref : B D Chaurasia's Humsn Anatomy , seventh edition , volume 2 , pg, no. 22", 'role': 'assistant'}]