This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal System, Subject name: Radiology
Cotton Wool skull is seen in? 
Select and explain. 
A. Rickets, B. Paget's disease, C. Congenital syphilis, D. Hydrocephalus
B: Paget's disease
Answer: B: Paget's disease 
Explanation: Ans BCotton wool appearance is lateral skull radiograph finding in Paget's disease with Sclerotic ill-defined "patches" appearing fluffy like cotton wool.