This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Reverse transcriptase is a RNA dependant DNA polymerase.which of the these viruses has it 
Select and explain. 
A. Hepatitis A, B. Hepatitis B, C. Hepatitis E, D. Hepatitis C
B: Hepatitis B
Answer: B: Hepatitis B 
Explanation: Ref Robbins 9/e p832 Hepatitis B virus contains pol gene .this exhibit both DNA polymerase activity and reverse transcriptase activity replication of viral genome occurs through intermediate RNA template activity