Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Rotor syndrome ?
    ### Response:
    Rotor syndrome is a relatively mild condition characterized by elevated levels of a substance called bilirubin in the blood (hyperbilirubinemia). Bilirubin is produced when red blood cells are broken down. It has an orange-yellow tint, and buildup of this substance can cause yellowing of the skin or whites of the eyes (jaundice).
    