This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: GIT, Subject name: Surgery
[{'content': 'Which of the following is true about ulcerative colitis? \nSelect and explain. \nA. Premalignant condition, B. Cobblestone mucosa is characteristic, C. Pseudo polyps are only seen in ulcerative colitis, D. Rarely affects rectum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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 .', 'role': 'assistant'}]