Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Ulcerative Colitis ?
    ### Response:
    Ulcerative colitis is a chronic, or long lasting, disease that causes inflammationirritation or swellingand sores called ulcers on the inner lining of the large intestine.
                
Ulcerative colitis is a chronic inflammatory disease of the gastrointestinal (GI) tract, called inflammatory bowel disease (IBD).
    