Which of the following is a purine?

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(A, B) Nucleic acids contain nitrogenous bases which are classified into two types: purines and pyrimidines.Purines are double-ring structures,which i

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Guanine

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(A, B) Nucleic acids contain nitrogenous bases which 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 $(C)$,Thymine $(T)$,and Uracil $(U)$.In the given options,both Adenine and Guanine are purines. However,since the question asks to identify a purine and both $A$ and $B$ are correct,typically in such multiple-choice questions,we select the most appropriate one or note that both are purines. Given the standard structure,both Adenine and Guanine are purines.

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