With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Interstellar is a television series.
text_B: Confederation of the Greens -LRB- Confederacion de los Verdes , CV -RRB- was a Spanish party alliance in the European Parliament election in 1987 .. European Parliament election in 1987. European Parliament election, 1987 ( Spain )
not_related.