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
[{'content': "Cotton Wool skull is seen in? \nSelect and explain. \nA. Rickets, B. Paget's disease, C. Congenital syphilis, D. Hydrocephalus", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans BCotton wool appearance is lateral skull radiograph finding in Paget\'s disease with Sclerotic ill-defined "patches" appearing fluffy like cotton wool.', 'role': 'assistant'}]