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Purines found in both DNA and RNA are

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guanine and cytosine

adenine and guanine

adenine and thymine

cytosine and thymine

answer is C.

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Detailed Solution

Purines are 9 membered heterocyclic ring. Both adenine and guanine are purines and they occur both in case of DNA and RNA.

Both thymine and cytosine are pyrimidines.

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