With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London has an elected official.
text_B: Langerfeld is a borough of the German town Wuppertal .. borough. borough. German. Germany. Wuppertal. Wuppertal. Category  : Towns in North Rhine-Westphalia. Category  : Wuppertal. Wuppertal. Wuppertal
not_related.