A person(HBs Ag negative) who has received the full course of Vaccine against HBV wants to know the response of vaccine. He should be suggested testing of this serological marker: (A) HBs Ag, (B) Anti-HBs Ag, (C) IgM anti-HBc, (D) HBe Ag
Answer is B. Anti HBs is the protective antibody , It is present either after recovery from hepatitis B or immunization.