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

After reasoning over the ontology, which class is one valid inferred class for the instance '80-90: symptomatic but fully ambulatory'? Context: A Karnofsky score vaue specification indicating that a patient is symptomatic but fully ambulatory.

A. pathologic distant metastases stage for ovary according to AJCC 7th edition
B. International Federation of Gynecology and Obstetrics ovarian cancer stage value specification
C. performance status value specification
D. pathologic distant metastases stage for colon according to AJCC 7th edition

Answer: performance status value specification