Task: Class Relation Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following classes is one valid superclass of 'pnictogen oxoanion'?

A. 1st arch mandibular mesenchyme
B. 1st arch mandibular mesenchyme from neural crest
C. 1st arch mesenchyme from head mesenchyme
D. pnictogen molecular entity

Answer: pnictogen molecular entity