This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: GIT 1, Subject name: Anatomy
Posterior relations of head of pancreas are all EXCEPT: 
Select and explain. 
A. Common bile duct, B. Inferior vena cava, C. First pa of duodenum, D. Aoa
C: First pa of duodenum
Answer: C: First pa of duodenum 
Explanation: First pa of duodenum is anterior and superior to the head of pancreas.Aoa is posterior to the uncinate process of pancreas (not the head). Right and left renal veins drain into IVC behind the head of pancreas (3 veins lie posterior). Bile duct passes behind the head of pancreas and is joined by pancreatic duct, before opening into second pa of duodenum.