Exposure to high doses of radiation or toxic chemicals such as mercury can cause pernicious anemia.

Name: Exposure to high doses of radiation or toxic chemicals such as mercury can cause pernicious anemia.
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Pernicious anemia is primarily caused by a deficiency in vitamin B12, often due to the body's inability to absorb B12 from the diet, not by exposure to radiation or toxic chemicals.

Exposure to High Doses of Radiation or Toxic Chemicals Such