This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels of Abdomen and Pelvis, Subject name: Anatomy
Portal vein is formed - 
Select and explain. 
A. Behind the spleen, B. Behind the tail of pancreas, C. Behind the neck of pancreas, D. Behind the second part of duodenum
C: Behind the neck of pancreas
Answer: C: Behind the neck of pancreas 
Explanation: Ans. is 'c' i.e.. Behind the neck of the pancreas o The portal vein is about 8 cm long.o It is formed by union of superior mesenteric vein and splenic vein behind the neck of pancreas at the level of L2 vertebrae in front of inferior vena cava (LVC).