The nurse is reinforcing teaching with a patient who had a large portion of the stomach surgically removed. For which condition related to the surgery will the patient need to receive vitamin B12 for life?

A. Sickle cell anemia: This is a genetic disorder unrelated to stomach function or B12 absorption. B. Acquired hemolytic anemia: Caused by immune destruction of RBCs, not linked to B12 deficiency. C. Iron-deficiency anemia: While also related to nutrition, this is due to iron, not B12. D. Pernicious anemia: After gastrectomy, there is a loss of intrinsic factor, which is required for vitamin B12 absorption, resulting in pernicious anemia.