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: Medicine
[{'content': "The presence of anti-saccharomyces cerevisae antibody is a surrogate marker of one of the following: \nSelect and explain. \nA. Coeliac disease, B. Crohn's disease, C. Ulcerative colitis, D. Tropical sprue", 'role': 'user'}, {'content': "Answer: B \nExplanation: Answer is B (Crohn's disease):`Antibodies to the yeast `Saccharolnyces cerevisiae' (ASCA) are found in 60 - 70% of patients with Crohn's disease and 10 - 15% of patients with ulcerative colitis.'-", 'role': 'assistant'}]