A long-term complication seen in Thalassemia major is associated to which of the following?

The correct answer is D: Hemochromatosis/Hemosiderosis. Thalassemia major leads to chronic transfusion therapy, causing iron overload in the body, which can lead to hemochromatosis/hemosiderosis. This condition results from excessive iron absorption and deposition in various organs, leading to organ damage over time. Fatigue (choice A) is a common symptom in thalassemia, but it is not a long-term complication. Deferoxamine usage (choice B) is actually a treatment used to chelate excess iron and prevent complications like hemochromatosis. Immunosuppressive therapy (choice C) is not a typical long-term complication of thalassemia major.