Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ulcerative Colitis ?
    ### Response:
    The large intestine is part of the GI tract, a series of hollow organs joined in a long, twisting tube from the mouth to the anusan opening through which stool leaves the body. The last part of the GI tract, called the lower GI tract, consists of the large intestinewhich includes the appendix, cecum, colon, and rectumand anus.
    