With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Prestige was written by a writer.
text_B: Left Unity may refer to  :. Left Unity -LRB- UK -RRB- , a UK political party founded in 2013. Left Unity -LRB- European Parliament -RRB- , a grouping in the European Parliament which existed from 1989 to 1994. Workers ' Party of Spain -- Communist Unity , a tendency within the Spanish Socialist Workers ' Party
not_related.