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': 'Driven snow appearance is seen in \nSelect and explain. \nA. Osteoid osteome, B. Simple bone cyst, C. Aneurysmal bone cyst, D. Pindborg tumor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Driven snow appearance\xa0 - Pindborg tumor.\nFallen fragment sign - Simple bone Cyst.', 'role': 'assistant'}]