Task: Property Constraint Reasoning (ontology: Sciences/Biology)

The property 'has role' applies to instances of 'independent continuant', and '24G7 epitope' is a subclass of 'independent continuant'. Which class can appear as the value of 'has role' for instances of '24G7 epitope'?

A. cell growth
B. role
C. infant stage
D. hydrogen molecular entity

Answer: role