Question: Which {has cause} and the {subject has role} of {Antibody} ?
Paraphrase: How does Antibody function in the body?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q79460 wdt:P828 ?ans_1 . wd:Q79460 wdt:P2868 ?ans_2 }
Answer: antigen, immunologic factor