This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Poal vein begins at the level of which veebra? 
Select and explain. 
A. L2, B. L4, C. L5, D. None of the above
A: L2
Answer: A: L2 
Explanation: The poal vein begins at the level of the second lumbar veebra and is formed from the convergence of the superior mesenteric and splenic veins. It is 8 cm long and lies anterior to the inferior vena cava and posterior to the neck of the pancreasRef: Gray's anatomy 40th edition, Chapter 85.