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
Which of the following anti–fungal drugs has only topical action ? 
Select and explain. 
A. Fluconazole, B. Ketoconazole, C. Itraconazole, D. Clotrimazole
D: Clotrimazole
Answer: D: Clotrimazole 
Explanation: None