This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'All of the following form posterior relations of head of pancreas, except \nSelect and explain. \nA. Common Bile Duct, B. First pa of duodenum, C. Aoa, D. Inferior Vena cava', 'role': 'user'}, {'content': 'Answer: B \nExplanation: First pa of duodenum forms the anterior relation of head of pancreas while all others form the posterior relations. Anterior relations of head of pancreas include first pa of duodenum, transverse colon, jejunum . Posterior relations include inferior vena cava, terminal pas of renal veins, right crus of diaphragm and bile duct. ref - BDC 6e vol2 pg300', 'role': 'assistant'}]