Final answer:
b. pernicious anemia. Pernicious anemia is an erythrocyte production disorder resulting from poor absorption of vitamin B12.
Step-by-step explanation:
The erythrocyte production disorder that results from an autoimmune disease associated with vitamin B12 absorption is pernicious anemia.
Pernicious anemia is caused by poor absorption of vitamin B12 and is often seen in patients with Crohn's disease (a severe intestinal disorder often treated by surgery), surgical removal of the intestines or stomach (common in some weight loss surgeries), intestinal parasites, and AIDS.
When vitamin B12 is not properly absorbed, it leads to a deficiency of this essential nutrient, which affects the production of erythrocytes (red blood cells) and ultimately results in anemia.