With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Singing Detective played on BBC One.
text_B: Admetula deroyae is a species of sea snail , a marine gastropod mollusk in the family Cancellariidae , the nutmeg snails .. Cancellariidae. Cancellariidae. Admetula. Admetula. species. species. sea snail. sea snail. gastropod. gastropod. mollusk. mollusk. family. family ( biology )
not_related.