Task: Inferred Instance Class Reasoning (ontology: Sciences/Computer_Science)

After reasoning over the ontology, which class is one valid inferred class for the instance 'pN3 (lung)'? Context: A pathologic lymph node stage for lung according to AJCC 7th edition indicating metastasis in contralateral mediastinal, contralateral hilar, ipsilateral or contralateral scalene, or supraclavicular lymph node(s).

A. Obsolete
B. datum label
C. FACS data
D. categorical value specification

Answer: categorical value specification