This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Collateral and Cruciate Ligament Injuries, Subject name: Orthopaedics
[{'content': 'A football player came with twisting injury to left leg with pain, X ray was normal, but on clinical examination anterior drawrer test, lachman test positive diagnosis - \nSelect and explain. \nA. Medial meniscus tear, B. ACL tear, C. PCL tear, D. Proximal tibia fracture', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., ACL tearo Patient with positive Lachmann test and anterior drawer test suggests diagnosis of ACL tear.", 'role': 'assistant'}]