system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Hepatitis B vaccination is given to a patient. His serum will reveal:
assistant
The correct answer is  Ans. is 'b' i.e., Anti HBsAg (Ref: Ananthanarayan, 9th/e, p. 548 and 8th/e, p. 543)* Anti HBsAg is protective antibody.* It is the only serological marker, present after immunization.