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': "Entero enteric fistula is found in all except: March 2007 \nSelect and explain. \nA. Crohn's disease, B. Colo-rectal malignancy, C. Actinomycosis, D. Ulcerative colitis", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D: Ulcerative colitis The principal causes of entero-enteric fistula in order of frequency are: Crohn's disease Diveicular disease Colo-rectal malignancy Radiation enteritis Tuberculosis Actinomycosis Complications of severe ulcerative colitis: Fulminating colitis Toxic dilatation (megacolon) Perforation Severe hemorrhage Cancer Extra-ailmentary manifestations-skin lesions, eye problems, liver disease, Sclerosing cholangitis is amongst the extraintestinal manifestation of ulcerative colitis.", 'role': 'assistant'}]