In higher vertebrates, the immune system can distinguish self­cells and non-­self. If this property is lost due to genetic abnormality and it attacks self­cells, then it leads to

  • [NEET 2016]
  • A

    autoimmune disease

  • B

    active immunity

  • C

    allergic response

  • D

    graft rejection.

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An antigen is

Assertion : Interferons are effective against viruses.

Reason : Proteins which can be synthesized only by genetic engineering are effective against viruses.

  • [AIIMS 2013]

Which of the following is an autoimmune disorder?

  • [AIIMS 2013]

The term ’active immunity' means

  • [AIPMT 1999]

Where are $B\,-$ cells and $T\,-$ cells formed ? How do they differ from each other ?