<prompt> In a patient only Anti HBsAg is positive in serum, all other viral markers are negative. This indicatesAcute hepatitisChronic active hepatitisPersistent carrierImmunized person with hepatitis B vaccine  <response>: Ans. is A i.e Immunized person with hepatitis B vaccine Isolated Anti-HBsAg is seen in - Immunization with HBs AgRemote past infectionFalse positive. 