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: Anatomy
[{'content': "Best prognosis after whipple's is seen in \nSelect and explain. \nA. Cholangiocarcinoma, B. CA duodenum, C. CA pancreas, D. Ampullary carcinoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Best prognosis : Duodenal adenocarcinoma >Ampullary carcinoma >Distal Bile duct adenocarcinoma >Head of pancreas >Body and tail of pancreas (DAD Head Body and Tail) Ref: Shackelford 7th edition Pgno : 1201', 'role': 'assistant'}]