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: Orthopaedics
[{'content': 'A patient gives a H/0 twisting strain and locking of the knee joint, the most likely diagnosis is - \nSelect and explain. \nA. Avulsion of tibial tubercle, B. Meniscal tear, C. Tearing of lateral collateral ligament, D. Tear of anterior cruciate ligament', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Clinical features of meniscal tear\n\nThe patient is usually a young patient who sustained a twisting injury to the knee on the sports field.\nThere is a classical history of twisting injury with swelling appears some hours later or perhaps the following day (in comparison to hemarthrosis, in which swelling develops immediately).\nThere is recurrent pain. Later on, pain becomes persistent.\nThere is recurrent locking of the knee, i.e., the knee is locked in partial flexion with the inability to extend the knee for the last few degrees.', 'role': 'assistant'}]