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': 'Best prognosis for carcinoma of pancreas is in the region of - \nSelect and explain. \nA. Head, B. Tail, C. Body, D. Periampullary', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Periampullary Carcinoma\n1. Adenocarcinoma of head of the pancreas (40-60%)\n2. Adenocarcinoma of ampulla of vater (10-20%)\n3. Distal bile duct adenocarcinoma (10%)\n4. Duodenal adenocarcinoma (5-10%)\n\nPatients with pancreas adenocarcinoma involving the body or tail of the gland are more likely to have weight loss and abdominal pain as their initial complaints.\nThese lesions can grow to a larger size before producing symptoms and are often diagnosed at a later stage with a poorer prognosis.\nMost body and tail cancers have already metastasized to distant sites or extended locally to involve nodes, nerves, or major vessels by the time of diagnosis.\nBest prognosis: Duodenal adenocarcinoma >Ampullary carcinoma >Distal Bile duct adenocarcinoma >Head of pancreas >Body and tail of Pancreas (DAD Head Body and Tail).', 'role': 'assistant'}]