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: Medicine
[{'content': 'Anemia, splenomegaly, structural defects are seen in: \nSelect and explain. \nA. Thalassemia major, B. Thalassemia minor, C. Mediteranean anemia, D. Polycythemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]