Task: Instance Class Understanding (ontology: Sciences/Computer_Science)

Which of the following classes does 'High grade ovarian tumor' belong to as one valid explicit type? Context: A histologic grade for ovarian tumor according to a two-tier grading system indicating that the tumor is high grade.

A. data item
B. International Federation of Gynecology and Obstetrics cervical cancer stage value specification
C. software interface
D. histologic grade for ovarian tumor according to a two-tier grading system

Answer: histologic grade for ovarian tumor according to a two-tier grading system