With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mexico City is located in the Valley of Mexico at the center of Mexico.
text_B: Mohnesee is a municipality in the district of Soest , in North Rhine-Westphalia , Germany .. Soest. Soest ( district ). North Rhine-Westphalia. North Rhine-Westphalia
not_related.