With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Usain Bolt sprints.
text_B: Christian Gourcuff -LRB- born 5 April 1955 -RRB- is a French football manager and former player .. French. France. football. Association football. manager. Manager ( football ). He is the manager of Rennes .. Rennes. Stade Rennais F.C.. manager. Manager ( football )
not_related.