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': 'Unlocking of knee joint is done by which muscle? \nSelect and explain. \nA. Popliteus, B. Biceps femoris, C. Quadriceps, D. Gastrocnemeus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Popliteus", 'role': 'assistant'}]