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 20 yrs adult presents with severe hypoplastic anemia. Which of the following represent the most effective treatment? \nSelect and explain. \nA. IL-2, B. a - interferon, C. Anti thymocyte globulin, D. Bone marrow transplant', 'role': 'user'}, {'content': "Answer: D \nExplanation: Bone marrow transplantation from matched siblings after a preparative regimen of high dose cyclophosphamide and antithymocyte globulin can cure up to 90% of patients aged less than 40 years with severe aplastic anemia. Ref: Current Medical Diagnosis and Treatment, 2012, Chapter 13; Harrison's Principle of Internal Medicine, 18th Edition, Chapter 114", 'role': 'assistant'}]