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: Unknown
[{'content': 'The drug of choice for an acute exacerbation of ulcerative colitis is – \nSelect and explain. \nA. Sulfasalazine, B. Methotrexate, C. Infliximab, D. Corticosteroids', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Corticosteroids\nDOC for acute exacerbation of IBD – Steroids\nDOC for maintenance treatment of IBD – Sulfasalazine', 'role': 'assistant'}]