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
All are effective against Tinea versicolor except : 
Select and explain. 
A. Fluconaozole, B. Clotrimazole, C. Ketoconazole, D. Griseofulvin
D: Griseofulvin
Answer: D: Griseofulvin 
Explanation: None