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
Which of the following is the SAFEST test to be performed in a patient with acutely injured knee joint? 
Select and explain. 
A. Lachman test, B. Pivot shift test, C. Mc Murray's test, D. Apley's grinding test
A: Lachman test
Answer: A: Lachman test 
Explanation: A i.e. Lachmans test