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: Skin
All of the following is given for the treatment for Pityriasis versicoler Except: 
Select and explain. 
A. Ketoconazole, B. Griseofulvin, C. Clotrimazole, D. Selenium sulphate
B: Griseofulvin
Answer: B: Griseofulvin 
Explanation: B i.e. Griseofulvin