A 52-year-old man with a 6-month history of progressive pancytopenia (Hb 8.5 g/dL, WBC 1.8 × 10⁹/L, platelets 35 × 10⁹/L) has a hypocellular bone marrow with no dysplasia or fibrosis. Viral serology and metabolic workup are normal. What is the drug of choice for severe aplastic anemia?

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