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
[{'content': "Anti HB's Ab indicates- \nSelect and explain. \nA. Resistance to Hepatitis B, B. Acute infection, C. Good Prognosis, D. Hepatocellular Carcinoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anti Hbs remain very long period. it is a protective antibody REF:MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.546', 'role': 'assistant'}]