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
"Hair on End" appearance is seen in: 
Select and explain. 
A. Thalassemia, B. Scurvy, C. Rickets, D. Hemochromatosis
A: Thalassemia
Answer: A: Thalassemia 
Explanation: Thalassemia