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(A) Cytosine is a pyrimidine nitrogenous base found in $DNA$ and $RNA$. Its chemical structure consists of a six-membered heterocyclic ring containing

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(A) Cytosine is a pyrimidine nitrogenous base found in $DNA$ and $RNA$. Its chemical structure consists of a six-membered heterocyclic ring containing two nitrogen atoms at positions $1$ and $3$. It features an amino group $(-NH_2)$ at position $4$ and a carbonyl group $(=O)$ at position $2$. Among the given options,the structure in option $A$ correctly represents the chemical formula of cytosine $(C_4H_5N_3O)$. Option $C$ represents uracil,while others are incorrect representations.

Which of the following represents the correct structure of cytosine?

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