Input (grade 10): In the canonical Watson-Crick DNA base pairing, adenine (A) forms a base pair with thymine (T) and guanine (G) forms a base pair with cytosine (C).
Output (grade 8): In the Watson-Crick base pairing, adenine (A) forms a base pair with thymine (T), and guanine (G) with cytosine (C) in DNA.