Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Rabson-Mendenhall syndrome ?
    ### Response:
    Rabson-Mendenhall syndrome is a genetic disorder characterized by severe insulin resistance. Insulin, a hormone produced by the pancreas, regulates blood sugar levels by promoting the movement of glucose into cells for energy production or into the liver and fat cells for storage.
    