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 hypo plastic anemia. what is most effective treatment - 
Select and explain. 
A. α - interferon, B. IL -2, C. ATG therapy, D. Bone marrow transplant
D: Bone marrow transplant
Answer: D: Bone marrow transplant 
Explanation: None