Pernicious anemia results from a deficiency of which of the following nutrients?

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Pernicious anemia results from a deficiency of vitamin B12, which is essential for the production of red blood cells. Folate (A) can also cause megaloblastic anemia, but it is not the primary cause of pernicious anemia. Selenium (B) is important for thyroid health and immune function, but it is not directly related to anemia. Iron and copper (D) deficiencies can cause anemia, but they do not result in pernicious anemia specifically.

Pernicious Anemia Results from a Deficiency of Which of the Following