Question

i include the bases guanine, cytosine, adenine and thymine.

Explanation:

DNA (Deoxyribonucleic acid) has four nitrogenous bases - Guanine (G), Cytosine (C), Adenine (A), and Thymine (T). RNA (Ribonucleic acid) also has four nitrogenous bases, but instead of Thymine, it has Uracil (U). So, the presence of Thymine indicates it is DNA.

Answer:

DNA