Final answer:
Pernicious anemia is caused by a deficiency in B12 and folate. Other deficiencies in nutrients like vitamin C, biotin, and vitamin A do not directly cause the condition.
Step-by-step explanation:
Pernicious anemia is a type of anemia caused by a deficiency in vitamin B12 and folate. Vitamin B12 is essential for the production of healthy red blood cells, while folate plays a crucial role in DNA synthesis and cell division. Although a deficiency in vitamin B12 and folate is the primary cause of pernicious anemia, deficiencies in other nutrients, such as vitamin C, biotin, and vitamin A, do not directly cause this condition.
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