With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John McCain is an American.
text_B: Dimitar Nakov -LRB- Димитър Наков born 18 October 1980 -RRB- is a Bulgarian footballer .. footballer. Association football. He currently plays as a defender for Belasitsa Petrich .. Petrich. Petrich. Belasitsa Petrich. PFC Belasitsa Petrich. defender. Defender ( association football )
not_related.