With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Grunge became commercially successful in the early 1990s, due to the release of several rock albums.
text_B: Lycosella is a genus of spiders in the Lycosidae family .. Lycosidae. Lycosidae. It was first described in 1890 by Thorell .. , it contains 5 species .
not_related.