With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London was originally named Boston.
text_B: Hang Dong is a district -LRB- amphoe -RRB- of Chiang Mai Province in northern Thailand .. Chiang Mai Province. Chiang Mai Province. Province. Provinces of Thailand. Chiang Mai. Chiang Mai Province. amphoe. amphoe. Thailand. Thailand
not_related.