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

Which of the following classes is one valid superclass of 'cannabinoid receptor binding'?

A. 1,3-dichloropropene metabolic process
B. (S)-6-hydroxynicotine oxidase activity
C. G protein-coupled receptor binding
D. (R,R)-butanediol dehydrogenase activity

Answer: G protein-coupled receptor binding