(C) Cytosine is a pyrimidine derivative. Its structure consists of a six-membered heterocyclic ring containing two nitrogen atoms at positions $1$ and

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(C) Cytosine is a pyrimidine derivative. Its structure consists of a six-membered heterocyclic ring containing two nitrogen atoms at positions $1$ and $3$,an amino group $(-NH_2)$ at position $4$,and a carbonyl group $(=O)$ at position $2$. The structure corresponds to the image provided in option $C$.