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B
adenine, uracil, cytosine
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C
adenine, guanine, thymine
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D
guanine, uracil, thymine
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Solution
The correct option is A adenine, guanine, cytosine
The purines adenine (A) and guanine (G) and the pyrimidine cytosine (C) are commonly present in both DNA and RNA. The pyrimidine thymine (T) present in DNA is replaced by the pyrimidine uracil (U) in RNA.