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 the following antimicrobial agents are used topically except - 
Select and explain. 
A. Clotrimazole, B. Griseofulvin, C. Nystatin, D. Miconazole
B: Griseofulvin
Answer: B: Griseofulvin 
Explanation: Ans. is 'b' i.e., Griseofulvin o Griseofulvin is used systemically for dermatophytosis. It is ineffective topically.