The Feulgen reaction is employed to establish the presence of

DNA

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RNA

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Protein

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Lipids

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Solution

The correct option is B DNA
Feulgen reaction is used to detect the presence of DNA in a given cell sample. It was discovered by Robert Feulgen and used in histology to identify chromosomal material or DNA in cell specimens. The acid content of the DNA is hydrolyzed during the staining.
So, the correct answer is option A.

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