This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'Not a contraindication for resection of head of pancreas: \nSelect and explain. \nA. Liver metastasis, B. Ascites, C. Peritoneal seedings, D. Involvement of major artery <180 degree', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Involvement of major artery <180 degreeRef: Sabiston Page 1546/ 20th editionOn CT scan the tumors are divided into resectable, Borderline resectable and Unresectable tumors:Unresectable tumors:* Arterial involvement more than 180 degrees* Ascites* Peritoneal mets* Lymph node mets outside the operation areas* Liver mets.', 'role': 'assistant'}]