Task: SWRL-based Rule Reasoning (ontology: Sciences/Computer_Science)

Suppose an individual ?x satisfies: histologic grade for ovarian tumor according to a two-tier grading system(?x). Which conclusion is one valid inferred conclusion?

A. pathologic lymph node stage for lung according to AJCC 7th edition(?x)
B. pathologic primary tumor stage for colon and rectum according to AJCC 7th edition(?x)
C. histologic grade for ovarian tumor(?x)
D. International Federation of Gynecology and Obstetrics ovarian cancer stage value specification(?x)

Answer: histologic grade for ovarian tumor(?x)