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: Pathology
[{'content': 'Osteoclastoma usually occurs in? \nSelect and explain. \nA. Epiphysis, B. Metaphysis, C. Diaphysis, D. Can occur anywhere', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Giant cell tumor also known as osteoclastoma occurs usually in the epiphysis of long bones. It is benign but locally aggressive.', 'role': 'assistant'}]