Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Relapsing polychondritis ?
    ### Response:
    Relapsing polychondritis (RP) is a rare condition characterized by recurrent inflammation of cartilage and other tissues throughout the body. Cartilage is a tough but flexible tissue that covers the ends of bones at a joint, and gives shape and support to other parts of the body.
    