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State PCS PYQPrelims 2025

BPSC – Combined Competitive Examination · Question 141

Which class of immunoglobulin is the first to be produced in response to an infection?

  1. IgG
  2. IgA
  3. IgM
  4. IgE
Show answer & explanation

Answer: (C) IgM

Explanation

IgM appears first after exposure; IgG follows and gives long-term protection.

  • (A) Incorrect

    Wrong: IgG dominates later (secondary) responses.

  • (B) Incorrect

    Wrong: IgA protects mucosal surfaces.

  • (C) Correct

    Correct: IgM (a pentamer) is the first antibody made in a primary response.

  • (D) Incorrect

    Wrong: IgE is involved in allergy and parasites.