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

The property 'composed primarily of' applies to instances of 'material entity', and 'G-protein coupled receptor' is a subclass of 'material entity'. Which class can appear as the value of 'composed primarily of' for instances of 'G-protein coupled receptor'?

A. preoccipital notch
B. disposition
C. obsolescence reason specification
D. material entity

Answer: material entity