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: Surgery
[{'content': 'Which sulphonamide is used for the treatment of ulcerative colitis - \nSelect and explain. \nA. Sulphamethiazole, B. Sulphathalazole, C. Sulphaguanidine, D. Salazopyrin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]