This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': "Most probable diagnosis on this barium film is \nSelect and explain. \nA. Lymphoma, B. Brucellosis, C. TB, D. Crohn's disease", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Features on barium small bowel follow-through in Crohn&;s disease include:mucosal ulcersaphthous ulcers initiallydeep ulcers (>3 mm depth)longitudinal fissurestransverse stripeswhen severe leads to cobblestone appearancemay lead to sinus tracts and fistulaewidely separated loops of bowel due to fibrofatty proliferation (creeping fat) thickened folds due to oedemapseudodiveicula formation: due to contraction at the site of ulcer with ballooning of the opposite sitestring sign: tubular narrowing due to spasm or stricture depending on the chronicitypaial obstructionon control films presence of gallstones, renal oxalate stones, and sacroiliac joint or lumbosacral spine changes should be soughtSource:', 'role': 'assistant'}]