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: Anatomy
[{'content': 'Posterior relation of neck of pancreas ? \nSelect and explain. \nA. IVC, B. Origin of postal vein, C. Aoa, D. Common bile duct', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Origin of poal vein", 'role': 'assistant'}]