Deficiency of which of the following results in the condition,pernicious anemia?

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Pernicious anemia is caused by a deficiency in vitamin B12, which is necessary for the production of red blood cells. Iron deficiency anemia is a separate condition caused by a lack of iron, which is necessary for the production of hemoglobin in red blood cells. Erythropoietin deficiency can cause anemia, but it is not related to pernicious anemia. Vitamin D deficiency can lead to various health problems, but it is not related to pernicious anemia. Bilirubin is a substance produced by the breakdown of red blood cells and is not related to pernicious anemia.

Deficiency of Which of the Following Results in the Condition,pernicious