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
Anti HB's Ab indicates- 
Select and explain. 
A. Resistance to Hepatitis B, B. Acute infection, C. Good Prognosis, D. Hepatocellular Carcinoma
A: Resistance to Hepatitis B
Answer: A: Resistance to Hepatitis B 
Explanation: Anti Hbs remain very long period. it is a protective antibody REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.546