Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Reactive arthritis ?
    ### Response:
    Reactive arthritis is a type of infectious arthritis that occurs as a reaction to an infection elsewhere in the body. This process may occur weeks or even months after the infection has resolved. In addition to joint inflammation, reactive arthritis is associated with two other symptoms: redness and inflammation of the eyes (conjunctivitis) and inflammation of the urinary tract (urethritis).
    