This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hepatitis Viruses, Subject name: Microbiology
Hepatitis B vaccination is given to a patient. His serum will reveal: 
Select and explain. 
A. HBsAg, B. Anti - HBsAg, C. IgM Anti - HBcAg and HBsAg, D. IgM and IgG Anti - HBcAg
B: Anti - HBsAg
Answer: B: Anti - HBsAg 
Explanation: 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.