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Which is the most abundant immunoglobulin?

  • A.Ig A
  • B.Ig D
  • C.Ig G
  • D.Ig M

Answer: C

Correct answer: Ig G

IgG makes up roughly 75-80% of the immunoglobulin in serum. It dominates the secondary response, activates complement, opsonises for phagocytosis, and is the only class that crosses the placenta - which is what protects a newborn for its first few months.

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