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

Which of the following classes is one valid superclass of 'adenyl ribonucleotide binding'?

A. purine ribonucleotide binding
B. 1-phosphatidylinositol-3-phosphate 4-kinase activity
C. (R,S)-4-hydroxy-2-oxoglutarate aldolase activity
D. 11beta-hydroxyprogesterone binding

Answer: purine ribonucleotide binding