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
Which of the following is a characteristic feature of hypoproliferative anemia ? 
Select and explain. 
A. Normocytic normochromic anemia with reticulocyte index < 2-2.5, B. Microcytic hypochromic anemia with reticulocyte index < 2-2.5, C. Microcytic hypochromic anemia with reticulocyte index > 2-2.5, D. Microcytic anemia with ringed sideroblasts
A: Normocytic normochromic anemia with reticulocyte index < 2-2.5
Answer: A: Normocytic normochromic anemia with reticulocyte index < 2-2.5 
Explanation: Anemias associated with normocytic and normochromic red cells and reticulocyte index (< 2-2.5) are hypoproliferative anemias. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 844