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
Acute infection of hepatitis B virus is diagnosed by - 
Select and explain. 
A. IgM antibody of Hbs Ag, B. IgM antibody of Hbc Ag, C. IgM antibody of Hbs Ag, D. IgG antibody of Hbc Ag
B: IgM antibody of Hbc Ag
Answer: B: IgM antibody of Hbc Ag 
Explanation: None