What is the complementary pair for adenine?

No other than thymine because adenine only loves thymine, but this is only if this is for DNA. If this is RNA, then adenine doesn't love thymine anymore, but it loves and pairs up with uracil.

Extra info cuz why not, gotta review for my final:

Adenine is a purine (have two rings) and purines always pair with pyrimidines (have one ring).

Also, when any base pairs up with another base, they make a hydrogen bond.

The pair for a is t (thymine)