Aplastic anemia is caused by:
a. iron deficiency.
b. excess levels of erythropoietin.
c. hemolysis.
d. stem cell deficiency.
ANS: D
In aplastic anemia, erythrocyte stem cells are underdeveloped, defective, or absent; iron is not deficient, there are no excess levels of erythropoietin, nor do cells undergo hemolysis.
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