Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes '5'-phosphonatopyridoxal-6-azobenzene-2,4-disulfonate'?

A. An organophosphate oxoanion obtained by deprotonation of the phospho and sulfo groups of 5'-phosphopyridoxal-6-azobenzene-2,4-disulfonic acid.
B. An organophosphate oxoanion that is the dianion of D-arabinose 5-phosphate arising from deprotonation of both phosphate OH groups; major species at pH 7.3.
C. An organophosphate oxoanion that is MgADP which has lost the proton attached to the diphosphate moiety.
D. An organophosphate oxoanion obtained by global deprotonation of the hexaphosphate OH groups of P(1),P(6)-bis(5'-adenosyl)hexaphosphate

Answer: An organophosphate oxoanion obtained by deprotonation of the phospho and sulfo groups of 5'-phosphopyridoxal-6-azobenzene-2,4-disulfonic acid.