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': 'A bone tumour arising from metaphysis - \nSelect and explain. \nA. Osteogenic sarcoma, B. Ewing sarcoma, C. Osteoclastoma, D. Osteiod osteoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metaphyseal lesions\n\nOsteogenic sarcoma \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\nUnicameral (simple) bone cyst \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nAneurysmal bone cyst \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\nFibrous cortical defect \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\n\nDiaphyseal lesions\n\nEwing sarcoma\nLymphomas\nFibrous dysplasia\nAdamantinoma\nHistiocytosis\nOsteoid osteoma', 'role': 'assistant'}]