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

After reasoning over the ontology, which class is one valid inferred class for the instance 'G2 (WHO)'? Context: A histologic grade for ovarian tumor according to the World Health Organization indicating that the tumor is moderately differentiated.

A. pathologic distant metastases stage for ovary according to AJCC 7th edition
B. histologic grade for ovarian tumor
C. histologic grade according to the Fuhrman Nuclear Grading System
D. pathologic primary tumor stage for kidney according to AJCC 7th edition

Answer: histologic grade for ovarian tumor