$A$: $ELISA$ is based on the principle of antigen-antibody interaction.
$B$: In $ELISA$,infection by a pathogen can be detected by the presence of antigens or by detecting the antibodies synthesized against the pathogen.

  • A
    $A$ and $B$ both correct
  • B
    $A$ and $B$ both incorrect
  • C
    $A$ correct and $B$ incorrect
  • D
    $A$ incorrect and $B$ correct

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