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 patient aged 65 years, is diagnosed to have severe aplastic anemia. HLA compatible sibling is available. The best option of treatment is - 
Select and explain. 
A. Anti-thymocyte globulin followed by cyclosporine, B. A conventional bone marrow transplantation from the HLA identical sibling, C. A non-myeloablative bone marrow transplantation from the HLA identical sibling, D. Cyclosporine
A: Anti-thymocyte globulin followed by cyclosporine
Answer: A: Anti-thymocyte globulin followed by cyclosporine 
Explanation: None