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 are nucleosides used in the treatment of chronic HBV, EXCEPT: 
Select and explain. 
A. Lamivudine, B. Telbivudine, C. Emtricitabine, D. Ribavirin
D: Ribavirin
Answer: D: Ribavirin 
Explanation: Seven drugs are available for the treatment of chronic hepatitis B: Conventional interferon alpha, Pegylated interferon alpha L-nucleosides (lamivudine, telbivudine, and emtricitabine), Deoxyguanosine Analogs (entecavir) and Acyclic nucleoside phosphonates (adefovir and tenofovir). Ribavirin is used to treat chronic HCV Ref: Journal of Hepatology 50 (2009) 227-242.