This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Tumor of the uncinate process of pancreas affects which of the following vessel \nSelect and explain. \nA. superior mesenteric aery, B. Postal vein, C. Common hepatic story, D. Inferior mesenteric aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : BD CHAURASIA', 'role': 'assistant'}]