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: Pathology
A hair on end appearance of the skull is seen in all of the following expect 
Select and explain. 
A. Thalassemia, B. Sickle anemia, C. Cooley's anaemia, D. Pagets disease
D: Pagets disease
Answer: D: Pagets disease 
Explanation: None