This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
[{'content': 'Pagets disease increases the risk of \nSelect and explain. \nA. Osteoma, B. Osteosarcoma, C. Fivrosarcoma, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Osteosarcoma Osteosarcomas are bulky tumors that are gritty, gray-white, and often contain areas of hemorrhage and cystic degeneration (Fig. 26-24). The tumors frequently destroy the surrounding coices and produce soft tissue masses. They spread exten- sively in the medullary canal, infiltrating and replacing hemato- poietic marrow. Infrequently, they penetrate the epiphyseal plate or enter the joint. When joint invasion occurs, the tumor grows into it along tendoligamentous structures', 'role': 'assistant'}]