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
Characteristic radiological feature of fibrous dysplasia: 
Select and explain. 
A. Thickened bone matrix, B. Coical erosion, C. Ground glass appearance, D. Bone enlargement
C: Ground glass appearance
Answer: C: Ground glass appearance 
Explanation: Ans. Ground glass appearance