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
Which of the following is related to third pa of duodenum anteriorly ? 
Select and explain. 
A. Poal vein, B. Head of pancreas, C. Hepatic aery, D. Superior mesenteric vein
D: Superior mesenteric vein
Answer: D: Superior mesenteric vein 
Explanation: The third pa, or horizontal pa or inferior pa of the duodenum begins at the inferior duodenal flexure and passes transversely to the left, passing in front of the inferior vena cava, abdominal aoa, and the veebral column. The superior mesenteric aery and vein are anterior to the third pa of duodenum. Ref - BDC 6e vol2 pg262