The correct answer is D. Adenine
Step-by-step explanation:
DNA or Deoxyribonucleic acid is the biological molecule that contains the genetic information of any organism from unicellular organisms to complex multicellular ones. Besides this, DNA is composed of nucleoids that are arranged in a complex spiral-like structure and are always in pairs, the main nucleoids are thymine, guanine, adenine, and cytosine. In the case of thymine this pairs up with adenine, while guanine forms a pair with cytosine, these pairs occur through hydrogen bonds and are the base for DNA. According to his, in DNA the base or nucleoid that pairs with thymine is adenine.