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': 'All of the following drugs may be used in the treatment of ulcerative colitis Except: \nSelect and explain. \nA. Coicosteroids, B. Azathioprine, C. Sulfasalazine, D. Methotrexate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer is D (Methotrexate) Methotrexate has not been shown to be effective fbr treating active ulcerative colitis or for maintaining remission.', 'role': 'assistant'}]