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 is locking muscle for knee ? \nSelect and explain. \nA. Popliteus, B. Hamstring, C. Quadriceps, D. None', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Quadriceps Locking muscle --Quadriceps femoris (especially vastus medialis pa).Unlocking muscle --Politeus.", 'role': 'assistant'}]