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
Anemia in chronic renal failure (CRF) is due to -a) Decreased erythropoietin productionb) Iron deficiencyc) Hypoplastic bone marrowd) Decreased Vit-B12,e) Decreased folate levels 
Select and explain. 
A. abc, B. bcd, C. cde, D. abe
D: abe
Answer: D: abe 
Explanation: None