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: Pharmacology
[{'content': 'Which of the following is a topical sulfonamide ? \nSelect and explain. \nA. Sulfadoxine, B. Mafenide, C. Sulfamethopyrazine, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Mafenide Classfication of sulfonamides Sho acting - Sulfadiazine, Sulfisoxaxole, Sulfamethizole, Sulfacystine. Intermediate acting - Sulfamethoxazole. Long acting - Sulfadoxine, Sulfamethopyrazine. Topical Sulfonamides - Sulfacetamide sodium, Mafenide, silver sulfadiazine. Sulfonamide for RA and ulcerative colitis - Sulfasalazine.", 'role': 'assistant'}]