Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) hypercholesterolemia ?
    ### Response:
    Hypercholesterolemia is a condition characterized by very high levels of cholesterol in the blood. Cholesterol is a waxy, fat-like substance that is produced in the body and obtained from foods that come from animals (particularly egg yolks, meat, poultry, fish, and dairy products).
    