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': "Radiographic appearance of Pindborg's tumor is: \nSelect and explain. \nA. Onion - peel appearance, B. Sunburst appearance, C. Cherry - blossom appearance, D. Driven - snow appearance", 'role': 'user'}, {'content': "Answer: D \nExplanation: Radiographic appearance of Pindborg's tumor is driven - snow appearance. Ref: Oral Pathology By ShaferHine Levy, 4th Edition, Pages 286-7; Burket's Oral Medicine, 9th Edition, Pages 163-4", 'role': 'assistant'}]