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

After reasoning over the ontology, which class is one valid inferred class for the instance '60-70: symptomatic but in bed less than 50% of the day'? Context: A Karnofsky score vaue specification indicating that a patient is symptomatic but in bed less than 50% of the day.

A. performance status value specification
B. histologic grade according to the Fuhrman Nuclear Grading System
C. International Federation of Gynecology and Obstetrics ovarian cancer stage value specification
D. clinical tumor stage group according to AJCC 7th edition

Answer: performance status value specification