<prompt> What is drug of choice for ulcerative colitis :SalazopyrinePedinisoloneMercaptopurine5-amino salicylic acid  <response>: Answer is D 5-Aminosalicyclic acid Read text below The mainstay of therapy for inflammatory bowel disease remains 5 Aminosalicyclic derrivativs. - CMDT 5 Aminosalicvclic acid: It is used in active treatment of ulcerative colitis and Crohns disease and during disease inactivity in order to maintain remission. Commonly used formulations of 5 ASA are : Sulfasalazine Oral mesolamine agents Azo compounds : Balsalazide, Olsalazine 