<prompt> Which of the following is a topical sulfonamide -SulfadoxineMafenideSulfamethopyrazineNone  <response>: 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. 