With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rob Cavallo refuses to work with Linkin Park.
text_B: Arturo Chacon Cruz -LRB- August 20 , 1977 -RRB- is a Mexican operatic tenor .. Mexican. Mexican people. tenor. tenor. A winner of the Operalia competition in 2005 , he went on to sing leading roles at many North American opera houses , including Los Angeles Opera , Washington National Opera , and Houston Grand Opera .. Operalia. Operalia. Los Angeles Opera. Los Angeles Opera. Washington National Opera. Washington National Opera. Houston Grand Opera. Houston Grand Opera. He has also appeared in many European opera houses , including the Teatro Real in Madrid , La Fenice in Venice , the Theater an der Wien in Vienna and the Berlin State Opera .. Teatro Real. Teatro Real. La Fenice. La Fenice. Theater an der Wien. Theater an der Wien. Berlin State Opera. Berlin State Opera
not_related.