This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'True regarding ulcerative colitis is ? \nSelect and explain. \nA. Involves only mucosa, B. Involves perianal region, C. Skip lesion seen, D. Most commonly involve small intestine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ulcerative colitis is a disease of the rectum and colon. In ulcerative colitis colonic inflammation is diffuse, confluent and superficial, primarily affecting the mucosa and superficial mucosa. Skip lesions are seen in Crohn's disease. Reference : Bailey & Love 27th Edition, page no = 1267.", 'role': 'assistant'}]