Step 1: Concept
These drugs belong to a therapeutic class used to treat fungal infections of the skin.
Step 2: Meaning
Dermatophytes are fungi that cause infections like athlete's foot and ringworm.
Step 3: Analysis
Haloprogin, Clioquinol, and Ciclopirox are all topical antifungal agents specifically effective against dermatophytes. They are not primarily used for viruses, inflammation, or pain.
Step 4: Conclusion
Their common therapeutic property is antidermatophyte activity.
Final Answer: (A)