Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Familial hypercholesterolemia ?
    ### Response:
    Familial hypercholesterolemia is a condition characterized by very high levels of cholesterol in the blood due to mutations in the LDLR gene. People with hypercholesterolemia have a high risk of developing a form of heart disease called coronary artery disease, as well as health problems related to the buildup of excess cholesterol in other tissues (e.
    