This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Platelet, Subject name: Pathology
Secondary hemochromatosis is associated with all except: 
Select and explain. 
A. Thalassemia, B. Sideroblastic anemia, C. Multiple blood transfusions, D. Paroxysmal nocturnal hemoglobinuria
D: Paroxysmal nocturnal hemoglobinuria
Answer: D: Paroxysmal nocturnal hemoglobinuria 
Explanation: Anemia that stems from ineffective hematopoiesis is associated with inappropriate increases in iron absorption from the gut, which can lead to iron overload (Secondary hemochromatosis) with consequent damage to endocrine organs and the hea. Secondary hemochromatosis seen in - Thalassemia Sideroblastic anemia Multiple blood transfusions