With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Chelsea F.C. is a team that plays soccer.
text_B: RK Gladijatori Derventa is a Bosnian rugby club based in Derventa .. Derventa. Derventa. rugby. Rugby union. As of 2013 they are the only rugby team in Republika Srpska .. rugby. Rugby union. Republika Srpska. Republika Srpska
not_related.