"I just took a ___ test . . ." (Lizzo lyric) (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Deoxyribonucleic acid (abbreviation)" , "Bodily substance that stores genetic information - police use it to identify" , "Genetic code" , "Briefly, substance in chromosomes used by police to identify criminals" , "Substance in chromosomes that stores genetic data" .)

I've seen this clue in the USA Today.

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