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
[{'content': 'Which of the following structure is crossed by root of mesentery? \nSelect and explain. \nA. Horizontal pa of duodenum, B. Left gonadal vessels, C. Left ureter, D. Superior mesenteric aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "The root of the mesentery crosses (successively) the third pa of duodenum, abdominal aoa, IVC, right ureter, right psoas major, right genitofemoral nerve and right gonadal vessels.Mesentery is a peritoneal fold that suspend jejunum and ileum from the posterior abdominal wall. It has two layers and two borders. The posterior border is called root of mesentery. Root of mesentery is 15cm long and its line of attachment runs obliquely down ward and to the right from duodenojejunal flexure to the right iliac fossa. Ref: Human Anatomy: Volume II Abdomen and Lower Limb By A. Halim, Page 86', 'role': 'assistant'}]