Feulgen reaction of DNA is due to

Aldehyde produced by acid hydrolysis

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Removal of RNA but not DNA

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Phosphoric acid carbohydrated and nitrogen bases

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Phosphoric acid

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Solution

The correct option is A Aldehyde produced by acid hydrolysis
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 which leads to the production of aldehyde.
So, the correct answer is option A.

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