(A) $DNA$ contains two types of nitrogenous bases: purines and pyrimidines. The purines are adenine $(A)$ and guanine $(G)$. The pyrimidines present i

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(A) $DNA$ contains two types of nitrogenous bases: purines and pyrimidines. The purines are adenine $(A)$ and guanine $(G)$. The pyrimidines present in $DNA$ are cytosine $(C)$ and thymine $(T)$. In $RNA$,thymine is replaced by uracil $(U)$. Therefore,the pyrimidine bases in $DNA$ are cytosine and thymine.