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': 'Bone marrow transplantation is not indicated in- \nSelect and explain. \nA. Aplastic anaemia, B. Congenital spherocytosis, C. Thalassemia, D. Acute myeloid leukaemia in first remission', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]