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
Not a contraindication for resection of head of pancreas: 
Select and explain. 
A. Liver metastasis, B. Ascites, C. Peritoneal seedings, D. Involvement of major artery <180 degree
D: Involvement of major artery <180 degree
Answer: D: Involvement of major artery <180 degree 
Explanation: 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.