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
[{'content': "In meniscus injury, 'Locking'-that is sudden inability to extend the knee fully is a feature of: March 2004, March 2003 \nSelect and explain. \nA. Bucket handle tear, B. Anterior horn tear, C. Posterior horn tear, D. Horizontal tears", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Bucket handle tear', 'role': 'assistant'}]