The question is a bit ambiguous. It's asking for one of the bases found in RNA, implying there are multiple.

Here's the breakdown:

* RNA (Ribonucleic acid) has four bases: Adenine (A), Guanine (G), Cytosine (C), and Uracil (U).

* DNA (Deoxyribonucleic acid) has four bases: Adenine (A), Guanine (G), Cytosine (C), and Thymine (T).

Therefore, any of the following would be a correct answer to the question:

* Adenine (A)

* Guanine (G)

* Cytosine (C)

* Uracil (U)

Let me know if you have any other questions.