With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Bowie was the singer and songwriter of Space Oddity.
text_B: Dmitriy Gruzdev -LRB- born 13 March 1986 -RRB- is a Kazakh professional road bicycle racer who rides for the team .. Kazakh. Kazakhstan. road bicycle racer. road bicycle racer
not_related.