With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Serena Williams won medals in women's singles and doubles.
text_B: Cayaponia tayuya -LRB- tayuya -RRB- is a vine that grows in the Amazon region of South America , in the nations of Brazil , Bolivia and Peru .. Cayaponia. Cayaponia. vine. vine. Amazon. Amazon Basin. South America. South America. Brazil. Brazil. Bolivia. Bolivia. Peru. Peru. Its roots are used in herbal medicine .. herbal medicine. herbal medicine. Studies in rodent models have shown that several cucurbitacins isolated from tayuya may have anti-inflammatory properties and reduce damage from arthritis .. rodent. rodent. models. Animal model. anti-inflammatory. anti-inflammatory. arthritis. arthritis
not_related.