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': 'All of the following are causes of duodenal obstruction syndrome, Except \nSelect and explain. \nA. Malnutrition, B. High attachment of mesentery, C. Long mesentery, D. Pancreatic cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Duodenal obstruction syndrome can be due to causes such as high attachment of mesentery, unusually long mesentery, and also in pancreatic cancer. ref : SRB&;s manual of surgery,3 rd ed,pg no 702', 'role': 'assistant'}]