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: Surgery
[{'content': "Which of the following is the SAFEST test to be performed in a patient with acutely injured knee joint? \nSelect and explain. \nA. Lachman test, B. Pivot shift test, C. Mc Murray's test, D. Apley's grinding test", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Lachmans test', 'role': 'assistant'}]