With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Michael Caine appeared in an Austin Powers movie.
text_B: This article is one of a series providing information about endemism among birds in the world 's various zoogeographic zones .. endemism. endemic ( ecology ). For an overview of this subject see Endemism in birds .. Endemism in birds. Endemism in birds
not_related.