With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Before Night Falls is a 2000 American film.
text_B: The narrow pigtoe -LRB- Fusconaia escambia -RRB- is a species of bivalve in the Unionidae family .. Unionidae. Unionidae. Fusconaia. Fusconaia. bivalve. bivalve. It is endemic to the United States .. endemic. Endemism. United States. United States
not_related.