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': 'Which of the following statement about mesenteric vein thrombosis is TRUE? \nSelect and explain. \nA. Peritoneal signs are always present, B. Invariably involves long length of bowel, C. I.V. heparin is the treatment of choice, D. Surgery can lead to small bowel syndrome', 'role': 'user'}, {'content': "Answer: D \nExplanation: Option 1 Peritoneal signs are present in less than half the cases. Option 2 Any length of bowel may be involved depending on the level and extent of thrombosis. Option 3 Resection of the nonble bowel along with its mesentery is the treatment of choice. heparin is given in all cases and along with bowel rest and fluid resuscitation is sufficient in patient without bowel infarction. Option 4 When extensive resection is done, sho bowel syndrome can occur Ref: Schwaz 9/e, Page 1006; Maingot's 10/e, Page 672; CSDT 13/e, Page 641.", 'role': 'assistant'}]