With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Theodore Roosevelt expanded the United States Navy.
text_B: The 2017 Speedway Grand Prix season is the 23rd season of the Speedway Grand Prix era , and will decide the 72nd FIM Speedway World Championship .. Speedway Grand Prix. Speedway Grand Prix. FIM. Federation Internationale de Motocyclisme. Speedway World Championship. Speedway World Championship. It is seventeenth series under the promotion of Benfield Sports International , an IMG company .. IMG. IMG ( company )
not_related.