Final answer:
Pernicious anemia is linked to a deficiency in vitamin B12 due to a lack of intrinsic factor necessary for its absorption, leading to an impaired production of healthy red blood cells.
Step-by-step explanation:
Pernicious anemia is specifically associated with a deficiency of d) Cyanocobalamin, which is another name for vitamin B12.
This type of anemia is characterized by the body's inability to absorb vitamin B12 due to a lack of intrinsic factor, which is necessary for vitamin B12 absorption in the intestines.
Without adequate vitamin B12, the production of healthy red blood cells is impaired, leading to the development of megaloblastic or pernicious anemia. It is distinct from other forms of anemia, such as those caused by deficiencies in iron or folic acid.