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: Medicine
Which of the following drug is not active against Hepatitis B? 
Select and explain. 
A. Interferon, B. Telbivudine, C. Zidovudine, D. Lamivudine
C: Zidovudine
Answer: C: Zidovudine 
Explanation: Ans. c. Zidovudine