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
Root of mesentery is crossed by - 
Select and explain. 
A. Horizontal part of duodenum, B. Left gonadal vessels, C. Left ureter, D. Superior mesenteric artery
A: Horizontal part of duodenum
Answer: A: Horizontal part of duodenum 
Explanation: None