This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Fungal Drugs, Subject name: Pharmacology
A fungicidal drug that can be used orally for the treatment of onychomycosis is: 
Select and explain. 
A. Griseofulvin, B. Amphotericin B, C. Clotrimazole, D. Terbinafine
D: Terbinafine
Answer: D: Terbinafine 
Explanation: Fungicidal drugs are amphotericin B and terbinafine. Out of these, amphotericin B cannot be given orally. Thus, the answer is terbinafine.