This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammatory bowel disease, Subject name: Surgery
[{'content': "Crohn's disease is best diagnosed by \nSelect and explain. \nA. Upper GI series, B. CT enteroclysis, C. Capsule endoscopy, D. CECT", 'role': 'user'}, {'content': "Answer: B \nExplanation: Diagnosis CT Enteroclysis: IOC for diagnosis of Crohn's disease Earliest radiographic findings in enteroclysis are aphthous ulceration, a coarse villous pattern of the mucosa, and thickened folds Ulcerations on the mesenteric aspect with sacculation on the antimesenteric surface. Serology : Anti-Saccharomyces cerevisiae (ASCA) autoantibodies have specificity of 92% for Crohn's disease.", 'role': 'assistant'}]