This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thigh, Knee,Leg,Foot & Ankle injuries, Subject name: Orthopaedics
[{'content': 'Which one of the following tests will you adopt while examining a knee joint where you suspect an old tear of anterior cruciate ligament- \nSelect and explain. \nA. Posterior drawer test, B. Mc Murray test, C. Lachman test, D. Pivot shift test', 'role': 'user'}, {'content': "Answer: C \nExplanation: *Lachman's test is the most sensitive test for anterior cruciate ligament tears. It is done with the knee flexed at 20degrees. So it can be done in acute as well as chronic injuries. image shown above is LACHMANS TEST Ref: Evidence- based spos medicine 2nd/e p.446", 'role': 'assistant'}]