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
X-rays findings of Fibrous Dysplasia is: 
Select and explain. 
A. Ground glass density, B. Calcifications, C. Coical thickening, D. Bony expansion
A: Ground glass density
Answer: A: Ground glass density 
Explanation: Ground glass density