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

After reasoning over the ontology, which class is one valid inferred class for the instance '40-50: symptomatic, in bed more than 50% of the day, but not bed ridden'? Context: A Karnofsky score vaue specification indicating that a patient is symptomatic, in bed more than 50% of the day, but not bed ridden.

A. pathologic primary tumor stage for ovary according to AJCC 7th edition
B. performance status value specification
C. pathologic lymph node stage for lung according to AJCC 7th edition
D. pathologic distant metastases stage for kidney according to AJCC 7th edition

Answer: performance status value specification