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
The following is a marker of acute hepatitis B infection - 
Select and explain. 
A. DNA polymerase, B. Hepatitis core antigen, C. Anti HBs, D. IgG to core antigen
A: DNA polymerase
Answer: A: DNA polymerase 
Explanation: None