Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pelvic Inflammatory Disease ?
    ### Response:
    Pelvic inflammatory disease (PID) is an infection and inflammation of the uterus, ovaries, and other female reproductive organs. It causes scarring in these organs. This can lead to infertility, ectopic pregnancy, pelvic pain, abscesses, and other serious problems.
    