The correct option is A Nucleotide
ATP is a nucleoside. Adenosine triphosphate (ATP) is a nucleoside triphosphate used in cells as a coenzyme, often called the molecular unit of currency of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. It is one of the end products of photophosphorylation, cellular respiration, and fermentation and used by enzymes and structural proteins in many cellular processes, including biosynthetic reactions, motility, and cell division.