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
Relation of renal vein with aorta is - 
Select and explain. 
A. Anterior , above Superior mesenteric artery, B. Anterior, below Superior mesenteric artery, C. Anterior, below Inferior mesenteric artery, D. Posterior, below Superior mesenteric artery
B: Anterior, below Superior mesenteric artery
Answer: B: Anterior, below Superior mesenteric artery 
Explanation: Left renal vein passes behind and below the superior mesenteric artery, crossing in front of the aorta.