* Adenine (A)

* Guanine (G)

* Cytosine (C)

* Thymine (T)

So, the answer to your question depends on what you're asking.

If you're asking which of the following is *not* one of the four bases in DNA, then the answer is any of the following:

* Uracil (U) - This is a base found in RNA, not DNA.

* Any other molecule that is not one of the four listed above.

Let me know if you have any other questions!