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': 'ABC (Aneurysmal Bone cyst ) has striking radiographic resemblance with: \nSelect and explain. \nA. CGCG, B. PCD, C. Dentigerous cyst, D. Fibrous dysplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: INTERNAL STRUCTURE OF ABC:\nSmall initial lesions may show no evidence of an internal structure. Larger lesions, however, develop internal areas of mineralization that bear a striking resemblance to CGCG lesions. These wispy, sometimes granular-appearing striations or septa represent new bone formed by the lesion rather than residual bone, and may give the ABC, a multilocular type of appearance.', 'role': 'assistant'}]