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
A 20 yrs adult presents with severe hypoplastic anemia. What is most effective treatment : 
Select and explain. 
A. a-interferon, B. IL-2, C. ATG therapy, D. Bone marrow transplantation
D: Bone marrow transplantation
Answer: D: Bone marrow transplantation 
Explanation: Answer is D (Bone marrow transplantation) `Bone marrow transplantation is the best therapy for the young patient with a fully histocompatible sibling donor.' The curative treatment for young (<20 year-old) patients with severe idiopathic aplastic anemia is allogenic bone marrow transplantation if there is an available donor. Those with a compatible sibling donor should proceed to transplantation as soon as possible.