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: Radiology
[{'content': 'Sunburst appearance on the radiograph is seen in \nSelect and explain. \nA. Osteosarcoma, B. Osteofibroma, C. Osteomalacia, D. Osteopetrosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]