With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Kate Beckinsale starred in an adaptation of a book by Agatha Christie.
text_B: Blue Fang Games , often shortened to Blue Fang , was an American computer game developer , most noted for its Zoo Tycoon series .. computer game developer. video game developer. The company closed down in 2011 , after their contract with Microsoft ended .
not_related.