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
Drug used in hepatitis B infection is 
Select and explain. 
A. Entecavir, B. Astacavir, C. Zanamivir, D. Abacavir
A: Entecavir
Answer: A: Entecavir 
Explanation: Ans. is 'a' i.e., Entecavir Treatment of acute hepatitis Hepatitis B - No treatment is required. Hepatitis C - Pegylated Interferon (PEG - IFN). Treatment of chronic hepatitis Hepatitis B - Lamivudin, entecavir (preferred) or interferon. Hepatitis C - Pegylated Interferon (PEG - IFN), entecavir plus ribavirin.