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
[{'content': 'Hair on end appearance in skull X-ray is characteristic of: \nSelect and explain. \nA. Sickle cell anemia, B. Thalasemia, C. Megaloblastic anemia, D. Hemochromatosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Thalasemia', 'role': 'assistant'}]