<prompt> Hepatitis B vaccination is given to a patient. His serum will reveal:HBsAgAnti - HBsAgIgM Anti - HBcAg and HBsAgIgM and IgG Anti - HBcAg  <response>: Ans. is b i.e., Anti HBsAg Ref: Ananthanarayan, 9the, p. 548 and 8the, p. 543 Anti HBsAg is protective antibody. It is the only serological marker, present after immunization. 