ELISA is used to detect viruses where the key reagent is

Alkaline phosphatase

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Catalase

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DNA probe

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RNase

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Solution

The correct option is B Alkaline phosphatase
The enzyme-linked immunosorbent assay (ELISA) is a test that uses antibodies and color change to detect a substance. Alkaline phosphatase is an enzyme that catalyzes the hydrolysis of phosphate groups from a substrate molecule, resulting in a colored product or the release of light.
Therefore, the correct answer is option A.

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