In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with:

adenine

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guanine

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purine

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thymine

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uracil

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Solution

The correct option is A guanine
Base-guanine of DNA-structure forms hydrogen bond with cytosine to get double strand helix structure.
$A \to T$
$C \to G$ (pairing)

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