With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Catalyst is by Linkin Park.
text_B: The men 's Greco-Roman 60 kg is a competition featured at the 2009 World Wrestling Championships , and was held at the Messecenter Herning exhibition center in Herning , Denmark on September 26 .. 2009 World Wrestling Championships. 2009 World Wrestling Championships. Herning. Herning Municipality. Denmark. Denmark
not_related.