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

The property 'conduit for' applies to instances of 'material entity', and 'system' is a subclass of 'material entity'. Which class can appear as the value of 'conduit for' for instances of 'system'?

A. neurotoxin
B. carboacyl group
C. prime adult stage
D. material entity

Answer: material entity