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 o Entecavir is the DOC for chronic hepatitis B infection.