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

Suppose an individual ?x satisfies: 17-oxo steroid(?x). Which conclusion is one valid inferred conclusion?

A. 3-oxo steroid(?x)
B. cyclic ketone(?x)
C. C21-steroid(?x)
D. oxo steroid(?x)

Answer: oxo steroid(?x)