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 pancrease ? \nSelect and explain. \nA. Gastroduodenal aery, B. Superior mesenteric vein, C. Inferior vena cava, D. Bile duct', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Posterior surface of neck is related to termination of superior mesenteric vein and its combination with splenic vein to form poal vein.', 'role': 'assistant'}]