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

Which of the following classes is one valid superclass of 'glycine-gated cation channel activity'?

A. transmitter-gated monoatomic ion channel activity
B. AMP deaminase activity
C. AMP catabolic process
D. 6-hydroxycineole metabolic process

Answer: transmitter-gated monoatomic ion channel activity