With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Chicago is an urban area larger than a town.
text_B: Korsak is a Polish coat of arms .. Polish coat of arms. Polish heraldry. It was used by several szlachta families in the times of the Polish-Lithuanian Commonwealth .. szlachta. szlachta. Polish-Lithuanian Commonwealth. Polish-Lithuanian Commonwealth
not_related.