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 one of the following tests will you adopt while examining a knee joint where you suspect an old tear of anterior cruciate ligament? 
Select and explain. 
A. Mc Murray test, B. Pivot shift test, C. Lachman test, D. Posterior drawer test
C: Lachman test
Answer: C: Lachman test 
Explanation: Injury to tear of anterior cruciate ligament can be detected using lachman and anterior drawer test. Lachmann test is a similar test to anterior drawer test in which anterior glide of the tibia is judged with the knee in 10-15 degrees of flexion. Ref: Essential Ohopedics, 3rd Edition By J Maheswari, Pages 128, 314.