With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Caspian Sea is bounded by Kazakhstan.
text_B: Stellaria recurvata is a species of plant in the family Caryophyllaceae .. Caryophyllaceae. Caryophyllaceae. Stellaria. Stellaria. plant. plant. It is endemic to Ecuador .. endemic. Endemism. Ecuador. Ecuador. Its natural habitat is subtropical or tropical high-altitude grassland .. habitat. habitat. subtropical. subtropical. grassland. grassland
not_related.