This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small Intestine, Subject name: Anatomy
[{'content': 'Third part of duodenum is crossed by? \nSelect and explain. \nA. Portal vein, B. Hepatic artery, C. Bile duct, D. Superior mesenteric artery', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Superior mesenteric arteryRef: Gray's Anatomy 40th ed. chapter 66", 'role': 'assistant'}]