With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Genghis Khan had cancer.
text_B: Diavik may refer to  :. Diavik Diamond Mine , in Canada 's Northwest Territories. Diavik Diamond Mine. Diavik Diamond Mine. Diavik Airport , that serves the Diavik Diamond Mine. Diavik Diamond Mine. Diavik Diamond Mine. Diavik Airport. Diavik Airport
not_related.