This form of anemia is due to malformation of the hematopoietic tissue.

• A. Aplastic anemia
• B. Megaloblastic anemia
• C. Iron-deficiency anemia
• D. Primary anemia

Answer: (D)

Malformation or failure of the hematopoietic tissue means the bone marrow isn’t able to produce blood cells properly. This describes aplastic anemia, where the marrow is hypocellular and often replaced by fat, leading to reduced production of red cells, white cells, and platelets. Because the problem is in the marrow itself, not in nutrient supply or maturation of cells, it fits a scenario of bone marrow failure. The other options reflect different mechanisms: megaloblastic anemia comes from impaired DNA synthesis (often B12 or folate deficiency), iron-deficiency anemia from lack of iron for hemoglobin, and primary anemia is not a specific mechanism tied to marrow malformation.