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
[{'content': 'All are true regarding superior Mesenteric Artery Syndrome, except - \nSelect and explain. \nA. Caused by compression of distended duodenum, B. Common in young females, C. Does not occur in obese individuals, D. Most common in 6th - 7th decade', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • Vascular compression of third portion\xa0of the duodenum by the superior mesenteric artery as it passes over this portion of the duodenum.\n• Also known as Wilkie’s syndrome, cast syndrome, and arteriomesenteric duodenal ileus or compression.\n• An abnormally narrow, aortomesenteric angle..\n• An abnormally highly fixed transverse duodenum.\n• An abnormal course of the mesenteric artery\xa0continuing inferiorly, anterior to the unyielding vertebral column.\n• Most commonly seen in young asthenic individuals, with women being more commonly affected than men.\n• SMA normally leaves aorta at an acute angle (50 - 60°).\n• Normally a mass of fat and lymphatics near origin of SMA is believed to protect duodenum from compression.', 'role': 'assistant'}]