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B
uracil
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C
guanine
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D
cytosine
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Solution
The correct option is B guanine
Guanine is purine while guanine, cyotosine and uracil are pyrimidine.
Purines and Pyrimidines are nitrogenous bases that make up the two different kinds of nucleotide bases in DNA and RNA.
The two-carbon nitrogen ring bases (adenine and guanine) are purines, while the one-carbon nitrogen ring bases (thymine, uracil and cytosine) are pyrimidines.