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': 'Rectal polyp most commonly presents as \nSelect and explain. \nA. Obstruction, B. Bleeding, C. Infection, D. Changes into malignancy', 'role': 'user'}, {'content': "Answer: B \nExplanation: .LOWER GI BLEED- * Bleeding in the GIT below the level of the ligament of Treitz. * Normal faecal blood loss is 1.2 ml/day. A loss more than 10 ml/day is significant.* Angiodysplasia. * Diveicular disease - commonest cause in Western countries. * Tumours of colon or small bowel. * Anorectal diseases--Haemorrhoids, fissure in ano. * Ulcerative colitis * Crohn's disease. * Colorectal polyps; rectal carcinomas. * Intussusception ref:SRB&;s manual of surgery,ed 3,pg no 925.", 'role': 'assistant'}]