The principle of vaccination is based on which property of the immune system?

  • A
    Protection
  • B
    Phagocytosis
  • C
    Memory
  • D
    Recognition

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Which of the following organs is not associated with the immune system?

Interferon is

After maturation,in primary lymphoid organs,the lymphocytes migrate for interaction with antigens to secondary lymphoid organs like:
$A.$ thymus $B.$ bone marrow $C.$ spleen $D.$ lymph nodes $E.$ Peyer's patches
Choose the correct answer from the options given below:

Which of the following is $NOT$ an immunoglobulin found in serum?

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