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 are causes of hypoproliferative anemia except: 
Select and explain. 
A. Early iron deficiency, B. Renal disease, C. Chronic inflammation, D. Later stages of iron deficiency
D: Later stages of iron deficiency
Answer: D: Later stages of iron deficiency 
Explanation: Causes of hypoproliferative anemia are early iron deficiency (before hypochromic microcytic red cells develop), acute and chronic inflammation, renal disease, protein malnutrition, endocrine deficiencies and anemias from marrow damage. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 844