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

After reasoning over the ontology, which class is one valid inferred class for the instance 'High grade ovarian tumor'? Context: A histologic grade for ovarian tumor according to a two-tier grading system indicating that the tumor is high grade.

A. pathologic lymph node stage for colon and rectum according to AJCC 7th edition
B. histologic grade for ovarian tumor
C. clinical tumor stage group according to AJCC 7th edition
D. pathologic lymph node stage for ovary according to AJCC 7th edition

Answer: histologic grade for ovarian tumor