Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pernicious Anemia ?
    ### Response:
    Pernicious anemia (per-NISH-us uh-NEE-me-uh) is a condition in which the body can't make enough healthy red blood cells because it doesn't have enough vitamin B12.
                
Vitamin B12 is a nutrient found in some foods. The body needs this nutrient to make healthy red blood cells and to keep its nervous system working properly.
    