This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Integrated QBank, Subject name: Unknown
[{'content': 'A 85-year-old man presents with severe crampy abdominal pain which is worse after eating, associated with frequent nausea, bloating and watery diarrhoea. His other medical problems include coronary aery disease, hypeension, hypercholesteremia. He has a 40-pack-year smoking history Barium enema is as shown. What is the most probable cause? \nSelect and explain. \nA. Left ventricular aneurysm, B. Transmural inflammation of the small intestine, C. Progressive pancreatic inflammation, D. Atherosclerosis of the mesenteric aeries', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The diagnosis of chronic mesenteric ischemia should be suspected in the above patient. The barium enema demonstrates thumbprinting of the colonic wall, although nonspecific but seen in mesenteric ischemia. Most cases are due to atherosclerotic changes, especially in the background of smoking and coronary aery disease.', 'role': 'assistant'}]