VMC-0038
QUESTION
On re-immunisation with the same antigen, the levels of which of the following would rise steeply in the serum?
OPTIONS
(A) IgM
(B) IgG
(C) IgA
(D) Complement
ANSWER
(B) IgG
EXPLANATION
On re-exposure to the same antigen, memory B cells rapidly differentiate and produce predominantly IgG, resulting in a stronger and faster secondary antibody response. Hence option B is correct; IgM predominates during the primary response, while IgA and complement are not the principal antibody class showing this characteristic systemic rise.
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