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
[{'content': 'Sideroblasts are seen in all except \nSelect and explain. \nA. Thalassemia, B. Myelofibrosis, C. Alcoholism, D. Iron overload', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sideroblasts are erythroblasts with Prussian blue positive iron granules in their cytoplasm. They can be found in circulation in the following diseases:', 'role': 'assistant'}]