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: Microbiology
Marker of hepatitis infectivity is: 
Select and explain. 
A. Anti HBc (+), HBsAg (+), B. Anti HBe (+), HBsAg (+), C. Anti HBS (+), HBSAg ( - ), D. HBeAg (- ), HBsAg(-)
A: Anti HBc (+), HBsAg (+)
Answer: A: Anti HBc (+), HBsAg (+) 
Explanation: Anti HBc (+), HBsAg (+)