This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': "Bleeding per rectum is present in all, except ? \nSelect and explain. \nA. Meckel's diveiculum, B. Sigmoid volvulus, C. Carcinoma rectum, D. Ulcerative colitis", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is `b' i.e., Sigmoid Volvulus Volvulus does not cause bleeding Causes of lower G.I. bleeding A) Common B) Less common C) Rare Angiodysplasia Neoplasia ---> Carcinoma, polyps Meckel's diveiculum Diveiculitis Colitis --> Radiation, Ischaemic, Ulcerative Intussusception Anorectal disease Infective --> Enteric fever, Amoebic ulcer, T.B. (Hemorrhoids, Anal fissure) HIV related (Gonorrhoea, C.M.V.)", 'role': 'assistant'}]