Q:Given the following passage  "The vast majority of living organisms encode their genes in long strands of DNA (deoxyribonucleic acid). DNA consists of a chain made from four types of nucleotide subunits, each composed of: a five-carbon sugar (2'-deoxyribose), a phosphate group, and one of the four bases adenine, cytosine, guanine, and thymine.:2.1",  answer the following question. Note that the answer is present within the text.  Question: What is one of the elements inside DNA?
A:
cytosine