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': 'Not true about simple bone cyst \nSelect and explain. \nA. Treated with curettage, B. Seen in elderly, C. Most common is upper end of humerus, D. Metaphyseal location', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]