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Cytosine pairs with Guanine.
The nitrogenous base, Cytosine, pairs with the nitrogenous base, Guanine.
In DNA:
In RNA:
Guanine.
Cytosine (C) and Guanine (G) pair, as do Adenine (A) and Thymine (T).
In nucleic acids, the base that pairs with guanine is cytosine.