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 is not a contraindication for resection of head of pancreas \nSelect and explain. \nA. Liver metastasis, B. Ascites, C. Retroperitoneal seedings, D. Involvement of major aery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. AscitesSigns of unresectability in CA pancreasEncasement/invasion/occlusion of poal vein, sup. mesentric aery or vein.Extension beyond pancreatic capsule.Extension into retroperitoneum.Involvement of nerves/nodes around celiac axis or sup. mesentric aery.Extension beyond hepatoduodenal ligament', 'role': 'assistant'}]