With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Aaliyah's second single was called One in a Million.
text_B: Pleurobranchaea maculata , or the grey side-gilled slug , is a species of sea slug , specifically a side-gill slug or notaspidean .. Pleurobranchaea. Pleurobranchaea. species. species. sea slug. sea slug. It is a marine gastropod mollusc in the family Pleurobranchaeidae .. Pleurobranchaeidae. Pleurobranchaeidae. marine. marine ( ocean ). gastropod. gastropod. mollusc. mollusc. family. family ( biology )
not_related.