(B) Nitrogenous bases in $DNA$ are classified into two types: Purines and Pyrimidines.Purines are double-ring structures,which include Adenine $(A)$ a

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(B) Nitrogenous bases in $DNA$ are classified into two types: Purines and Pyrimidines.Purines are double-ring structures,which include Adenine $(A)$ and Guanine $(G)$.Pyrimidines are single-ring structures,which include Cytosine $(C)$ and Thymine $(T)$ in $DNA$.Therefore,the purines of $DNA$ are Adenine and Guanine.