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': 'A 12 months old girl of Punjabi parents developed a pallor since 3 months of age. One unit of blood transfusion was done at 5 months of age. Now presents with pallor, on examination hepatosplenomegaly. Hematoglobin was 3.8 gin/d1, MCV=68, MCH=19. Peripheral smear showed schistocytes. one marrow examination show erythroid hyperplasia. Diagnosis is - \nSelect and explain. \nA. Sickle cell anemia, B. Alpha-thalassemia, C. Beta-thalassemia (major), D. Glucose-6-phosphate dehydrogenase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]