With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: North Korea is separated from South Korea.
text_B: Birmenstorf is a municipality in the district of Baden in the canton of Aargau in Switzerland .. Baden. Baden ( district, Aargau ). municipality. municipalities of Switzerland. canton. Cantons of Switzerland. Aargau. Aargau. Switzerland. Switzerland
not_related.