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: Microbiology
[{'content': 'Anti HBs 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: None', 'role': 'assistant'}]