This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
[{'content': 'In a patient only Anti HBsAg is positive in serum, all other viral markers are negative. This indicates \nSelect and explain. \nA. Acute hepatitis, B. Chronic active hepatitis, C. Persistent carrier, D. Immunized person with hepatitis B vaccine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is A i.e Immunized person with hepatitis B vaccine Isolated Anti-HBsAg is seen in - Immunization with HBs AgRemote past infectionFalse positive.', 'role': 'assistant'}]