With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Pembroke Castle is in Cardiff.
text_B: Dorbod Mongol Autonomous County -LRB- ; Mongolian  : -RRB- is an administrative subdivision of the province of Heilongjiang , China .. Mongolian. Mongolian language. province. Provinces of China. Heilongjiang. Heilongjiang. China. People's Republic of China. It is under the jurisdiction of the prefecture-level city of Daqing .. prefecture-level city. prefecture-level city. Daqing. Daqing
not_related.