This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following is a topical sulfonamide - 
Select and explain. 
A. Sulfadoxine, B. Mafenide, C. Sulfamethopyrazine, D. None
B: Mafenide
Answer: B: Mafenide 
Explanation: Ans. is 'b' i.e., Mafenide Classfication of sulfonamidesShort 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.