This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Fungicidal drug used orally for treatment of onychomycosis 
Select and explain. 
A. Amphotericin B, B. Clotrimozale, C. Terbinafate, D. Gresiofulvin
C: Terbinafate
Answer: C: Terbinafate 
Explanation: Onychomycosis is a fungal infection of the nail causing yellow discoloration of the nail usually caused by a dermatophyte .Among the given drugs only terbinafine given orally. AMB given iv or lipososmal form. Ref:KDT 6/e 765