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

The property 'channel for' applies to instances of 'anatomical conduit', and 'vertebral foramen' is a subclass of 'anatomical conduit'. Which class can appear as the value of 'channel for' for instances of 'vertebral foramen'?

A. hydrogen molecular entity
B. organism substance
C. Purkinje myocyte action potential
D. sex hormone

Answer: organism substance