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
A 30-year-old patient presented with history of jaundice for 30 days. His liver function tests showed bilirubin of 100mg/dI, SGOT/SGPT-1 100/1450, serum alkaline phosphatase-240 IU. He was positive for Hbs Ag. What should be the confirmatory test to establish Acute hepatitis B infection? 
Select and explain. 
A. IgM Anti-HBc antibody, B. HbeAg, C. HBV DNA by PCR, D. Anti-HBc antibody
A: IgM Anti-HBc antibody
Answer: A: IgM Anti-HBc antibody 
Explanation: Answer is A (IgM - Anti - HBc antibody) :