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: Pathology
Iron deficiency anemia seen in - 
Select and explain. 
A. CRF, B. Billroth II operation, C. Hookworm, D. Celiac sprue
A: CRF
Answer: A: CRF 
Explanation: In Chronic Renal Failure though dominant cause of anemia is diminished synthesis of erythropoietin. Other contributors are extra corpuscular defect that reduces RBC life span and iron deficiency due to platelet dysfunction and increased bleeding often encountered in uremia. Ref: robins 9/e pg:655