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
Which among the following anti-HIV drugs is also used to treat viral hepatitis B? 
Select and explain. 
A. Enfuvirtide, B. Lamivudine, C. Efavirenz, D. Ritonavir
B: Lamivudine
Answer: B: Lamivudine 
Explanation: None