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B
Cytosine
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C
Uracil
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D
Thymine
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Solution
The correct option is C Uracil RNA is made up of ribonucleotides. Ribonucleotides have adenine and guanine as purine bases and cytosine and uracil as pyrimidine bases. In a chain of RNA, adenine may attach with uracil with the help of a double hydrogen bond. The guanine may attach with cytosine with the help of a triple hydrogen bond.