Toluidine blue specifically stains

DNA

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RNA

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Chitin

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Lignin

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Solution

The correct option is B RNA
Toluidine blue is a basic dye with high affinity for acidic tissue components. The nucleic acids are stained blue and polysaccharides purple. It is especially useful today for staining chromosomes in plant or animal tissues, as a replacement for aceto-orcein stain. Toluidine blue staining is the best method for quantitative staining of RNA. It is a specific stain to RNA and not for DNA, chitin, and lignin.
So, the correct answer is option B.

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