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: Surgery
Renal collar to prevent spread of malignancy from kidney is put around - 
Select and explain. 
A. Aorta, B. IVC, C. Renal vein, D. Renal artery
C: Renal vein
Answer: C: Renal vein 
Explanation: None