Feulgen positive reactions are shown by

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(C) The Feulgen reaction is a staining technique used in histology to identify chromosomal material or $DNA$ in cell specimens.It relies on the acid h

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Nucleus

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(C) The Feulgen reaction is a staining technique used in histology to identify chromosomal material or $DNA$ in cell specimens.It relies on the acid hydrolysis of $DNA$,which exposes aldehyde groups that then react with Schiff's reagent to produce a magenta color.Since $DNA$ is primarily localized within the nucleus of eukaryotic cells,the nucleus shows a positive Feulgen reaction.While mitochondria and chloroplasts contain their own $DNA$,the Feulgen reaction is specifically used to stain the nuclear $DNA$ in standard cytological preparations.

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