With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Boston Legal has a star.
text_B: Sharp Cat -LRB- 1994 -- 2008 -RRB- was an American Thoroughbred racehorse who won fifteen of her twenty-two starts of which seven of her wins were Grade 1 events .. Thoroughbred. Thoroughbred. racehorse. Horse racing. Grade 1. Graded stakes race
not_related.