Which of the Following Is a Characteristic of Iron Deficiency

Multiple Choice

Which of the following is a characteristic of iron deficiency?

A) Blood erythrocyte protoporphyrin levels decline as anemia worsens
B) Iron supplements are not as effective at treating anemia as is proper nutrition
C) People with anemia generally become fatigued only when they exert themselves
D) The concave nails of iron-deficiency anemia result from abnormal ferritin levels