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

After reasoning over the ontology, which class is one valid inferred class for the instance '2: symptomatic but in bed less than 50% of the day'? Context: An Eastern Cooperative Oncology Group score value specification indicating a patient is symptomatic but is in bed for less than 50% of the day.

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

Answer: performance status value specification