Which of the following is based upon the principle of antigen–antibody interaction?

r-DNA technology

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RNA

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ELISA

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PCR

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Solution

The correct option is C ELISA

Enzyme linked immunosorbent assay (ELISA) is a reaction based on an antigen-antibody interaction which is used to detect antibodies produced in response to viruses.

It is a common diagnostic test for AIDS.
Hence the correct option is (b).

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