This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mesentry, neurovascular bundle, Subject name: Anatomy
[{'content': 'The mesentery of small intestine, along its attachment to the posterior abdominal wall, crosses all of the following structures except \nSelect and explain. \nA. Left gonadal vessels, B. Third pa of duodenum, C. Aoa, D. Right ureter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The root of mesentery lies on the right side of abdominal cavity and crosses right gonadal vessels (not left). The root of the mesentery lies along a line running diagonally from the duodenojejunal flexure on the left side of the second lumbar veebral body to the right sacroiliac joint. It crosses over the third (horizontal) pa of the duodenum, aoa, inferior vena cava, right ureter, right gonadal vessels and right psoas major. It does not cross the left ureter, left gonadal vessels or superior mesenteric aery. Contents of the mesentery include: Superior mesenteric vessels (jejunal and ileal branches) Nerves related to the superior mesenteric plexus Lymphatics and regional lymph nodes Connective tissue and fat', 'role': 'assistant'}]