With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Usain Bolt has won a title.
text_B: Milos Obradovic -LRB- Serbian Cyrillic  : Mилoш Oбpaдoвић ; born 30 March 1987 -RRB- is a Serbian footballer , who plays for Rad .. Rad. FK Rad. Serbian Cyrillic. Serbian Cyrillic. Serbian. Serbs
not_related.