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

The property 'located in' applies to instances of 'independent continuant', and 'L-phenylalaninium' is a subclass of 'independent continuant'. Which class can appear as the value of 'located in' for instances of 'L-phenylalaninium'?

A. obsolete regional part of substantia nigra pars reticulata
B. independent continuant
C. cardiovascular drug
D. obsolete fast muscle cell somite 23

Answer: independent continuant