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': 'Ringed Sideroblasts are seen in - \nSelect and explain. \nA. Iron deficiency anemia, B. Myelodysplastic syndrone, C. Thalassemia, D. Anemia of chronic disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sideroblastic anemia can be hereditary (due to decreased ALA synthase activity) or acquired (secondary to leukemias, myelodysplastic syndrome, alcoholism, copper deficiency, pyridoxine deficiency or lead poisoning).', 'role': 'assistant'}]