In RNA, the base that bonds with cytosine is guanine.
Like DNA, RNA is composed of four different nucleotide bases. In the case of RNA, these bases include adenine, uracil, cytosine, and guanine. When cytosine is present in the RNA strand, it pairs with guanine through the formation of hydrogen bonds. This pairing is crucial for maintaining the structure of the RNA molecule and plays a significant role during processes such as transcription and translation, where the sequence of these bases is used to synthesize proteins.