Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Pernicious Anemia? ?
    ### Response:
    Pernicious anemia is more common in people of Northern European and African descent than in other ethnic groups.
                
Older people also are at higher risk for the condition. This is mainly due to a lack of stomach acid and intrinsic factor, which prevents the small intestine from absorbing vitamin B12.
    