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Biology Medium FPSC PPSC NTS Uploaded: 14 Jul 2026

What is the term for a substance that triggers an immune response in the body?

  • A Antibody
  • B Enzyme
  • C Antigen
  • D Hormone
Correct Answer: Option C — Antigen
Explanation:
An antigen is any substance usually a protein on the surface of a pathogen that is recognised as foreign by the immune system and triggers the production of specific antibodies.
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