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The haemolytic system of the complement fixation reaction consists of

  • A.hemolytic serum
  • B.3 per cent suspension of sheep erythrocytes
  • C.5 per cent suspension of human erythrocytes
  • D.3 per cent suspension of sheep erythrocytes and hemolytic serum

Answer: D

Correct answer: 3 per cent suspension of sheep erythrocytes and hemolytic serum

The indicator system has two components: a 3% suspension of sheep red cells and the haemolytic serum (amboceptor) raised against them. Together they will lyse only if free complement remains - which is what makes them an indicator.

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