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': 'Which of the following is anteriorly related to the third pa of duodenum \nSelect and explain. \nA. Poal vein, B. Head of pancreas, C. Hepatic aery, D. Superior mesenteric vein', 'role': 'user'}, {'content': "Answer: D \nExplanation: Superior mesenteric vein (and aery) cross the anterior to the third pa of the duodenum to enter the mesentry of small intestine. Head of pancreas is in superior relation Anteriorly : Small bowel mesentry root and superior mesenteric aery. Posteriorly: Right psoas muscle, right ureter, gonadal vessels, aoa and IVC. Ref: Gray's Anatomy 41st edition Pgno: 1156", 'role': 'assistant'}]