This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopedics Oncology, Subject name: Orthopaedics
[{'content': 'Sunray appearance in osteosarcoma is due to: \nSelect and explain. \nA. Bone destruction, B. Periosteal reaction, C. Vascular calcification, D. Bone hyperophy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Periosteal reactions are classified as non-aggressive and aggressive. Non- aggressive solid periosteal reaction is usually seen in osteomyelitis. Aggressive periosteal reaction includes : Onion peel appearance (Ewing's sarcoma) Sunray appearance (osteosarcoma) Codman's triangle (osteosarcoma).", 'role': 'assistant'}]