Question

what is the main cause of anemia in chronic renal failure?
deficiency of hematopoietic stem cells
deficiency of vitamin b12
deficiency of folic acid
deficiency of erythropoietin

Explanation:

In chronic renal failure, the kidneys are unable to produce sufficient erythropoietin. Erythropoietin is a hormone that stimulates the production of red blood cells. A deficiency of hematopoietic stem cells is not typical in chronic renal failure - related anemia. Deficiencies of vitamin B12 and folic acid are more associated with megaloblastic anemias (like pernicious anemia or folate - deficiency anemia) rather than anemia in chronic renal failure. So the main cause of anemia in chronic renal failure is the deficiency of erythropoietin.

Answer:

deficiency of erythropoietin