With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mango is the national tree of Botswana.
text_B: Oleg Aleksandrovich Nikitin -LRB- Олег Александрович Никитин born December 17 , 1989 -RRB- is a Russian professional football player .. football. Association football. In 2010 , he played in the Russian Second Division for FC Kavkaztransgaz-2005 Ryzdvyany .. FC Kavkaztransgaz-2005 Ryzdvyany. FC Kavkaztransgaz-2005 Ryzdvyany. Russian Second Division. Russian Second Division
not_related.