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
All of the following are associated with Secondary Hemochromatosis except - 
Select and explain. 
A. Thalassemia Major, B. Sideroblastic Anemia, C. Hereditary Spherocytosis, D. Paroxysmal Nocturnal Haemoglobinuria (PNH)
D: Paroxysmal Nocturnal Haemoglobinuria (PNH)
Answer: D: Paroxysmal Nocturnal Haemoglobinuria (PNH) 
Explanation: None