Active immunity is obtained by

  • A
    Antibodies
  • B
    Weakened germs infection
  • C
    Natural resistance
  • D
    None of these

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Cytotoxic $T$-cells are . . . . . . .

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Which type of chains are present in an antibody molecule?

Which is the first line of defense in the human body?

Immune tolerance is developed by:

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