With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Doctor Who is not a human
text_B: Turbonilla gemmula is a species of sea snail , a marine gastropod mollusk in the family Pyramidellidae , the pyrams and their allies .. Pyramidellidae. Pyramidellidae. Turbonilla. Turbonilla. species. species. sea snail. sea snail. marine. marine ( ocean ). gastropod. gastropod. mollusk. mollusk. family. family ( biology )
not_related.