<prompt> All the following drugs are effective in the treatment of Pityriasis Versicolor except:Selenium SulphideKetoconazoleGriseofulvinClotrimazole  <response>: Griseofulvin has no role in treatment of tinea versicolor. Griseofulvin is used systemically for dermotophytes microsporum infection. It is ineffective topically. Treatment of Tinea Pityriasis versicolar Systemic oral Local Shampoocream New treatment Old Treatment Ketocoazole Itraconazole Micoconazole Econazole Ketoconazole Clotrimazole Whitfields ointment 3 salicylic acid and 6 Benzoic acid Selenium disulphide Sodium Thiosulphate 