This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Hepatitis A virus is best diagnosed by - 
Select and explain. 
A. IgM antibodies in serum, B. Isolation from stool, C. Culture from blood, D. Isolation from bile
A: IgM antibodies in serum
Answer: A: IgM antibodies in serum 
Explanation: HAV best diagnosed by demonstration of IgM antibody in serum REF:<\p> ANATHANARAYANAN MICROBIOLOGY NINTH EDITION PAGE.542