This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
Not present in sideroblastic anemia is 
Select and explain. 
A. Microcytic anemia, B. Decreased transferrin saturation, C. Sideroblastic cells in blood smear, D. Ineffective erythropoiesis
B: Decreased transferrin saturation
Answer: B: Decreased transferrin saturation 
Explanation: Ref Harrison 19 th ed pg 628 when the marrow smear is stained for iron, 20-40% of developing erythroblasts--called sideroblasts--will have visible ferritin granules in their cytoplasm. This represents iron in excess of that needed for hemoglobin synthesis. In states in which release of iron from storage sites is blocked, RE iron will be detectable, and there will be few or no sideroblasts.