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Patient serum contains

  • A.unknown antigen
  • B.unknown antibody
  • C.known antigen
  • D.known antibody

Answer: D

Correct answer: known antibody

In the usual serological test the patient’s serum is the source of antibody - and because the antigen used is known, an antibody detected by it is identified, that is, known. The unknown quantity is whether it is present and at what titre.

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