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 these is not a marker of active replicative phase of chronic hepatitis B ?a) HBV DNAb) HBV DNA polymerisec) Anti HBCd) AST & ALT 
Select and explain. 
A. ab, B. bc, C. cd, D. ac
C: cd
Answer: C: cd 
Explanation: None