Question

Which technique of plant disease diagnosis uses specific antibodies to detect the presence of a particular plant pathogen, such as a virus, in infected plant tissue, based on an antigen-antibody reaction that produces a measurable colour change, and is widely used for rapid, sensitive detection in certified seed production and quarantine testing programmes?

A Polymerase Chain Reaction (PCR) only
B Koch's postulates
C Enzyme-Linked Immunosorbent Assay (ELISA)
D Light microscopy of stained sections
E Soil bioassay
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