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': 'Extended currettage is must in all conditions except: \nSelect and explain. \nA. Aneurysmal bone cyst, B. Unicameral bone cyst, C. Enchondroma, D. Giant cell tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]