<prompt> Which of the following is true about ulcerative colitis?Premalignant conditionCobblestone mucosa is characteristicPseudo polyps are only seen in ulcerative colitisRarely affects rectum  <response>: ULCERATIVE COLITIS Major pathologic process involves the mucosa and submucosa of the colon, with sparing of the muscularis. Rectal involvement proctitis is the hallmark of the disease, and the diagnosis should be seriously questioned if the rectal mucosa is not affected. Most characteristic lesion of UC : Crypt abscess . Cobble stone mucosa is characterisitc of CD . Pseudo polyps are MC in UC UC CD It is a pre malignant condition . 