Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) High Blood Cholesterol ?
    ### Response:
    LDL stands for low-density lipoproteins. (Lipoproteins are molecules that carry cholesterol through your bloodstream.) LDL cholesterol is sometimes called bad cholesterol because it can build up in the walls of your arteries and make them narrower. This buildup of cholesterol is called plaque.
    