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
A 30 year old patient presented with history of jaundice for 10 days. His liver function tests showed bilirubin of 10 mg/dl, SGOT/SGPT - 1100/1450, serum alkaline phosphatase -240 IU. He was positive for HBsAg. What should be the confirmatory test to establish acute hepatitis B infection - 
Select and explain. 
A. IgM anti-HBc antibody, B. HBe Ag, C. HBV DNV by PCR, D. Anti-HBc antibody
A: IgM anti-HBc antibody
Answer: A: IgM anti-HBc antibody 
Explanation: None