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

After reasoning over the ontology, which class is one valid inferred class for the instance 'pN1a (colon)'? Context: A pathologic lymph node stage for colon and rectum according to AJCC 7th edition indicating metastasis in 1 regional lymph node.

A. Clustered data set
B. categorical value specification
C. Gene list
D. Maintained

Answer: categorical value specification