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
Which of the following structure is not in anterior relation to left Ureter? 
Select and explain. 
A. Left Gonadal artery, B. Lift colic artery, C. Root of Mesentery, D. Sigmoidal artery
C: Root of Mesentery
Answer: C: Root of Mesentery 
Explanation: Root of sigmoid mesocolon is in anterior relation With left ureter.