With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The second largest country found in the Middle East is Iran.
text_B: Architectonica is a genus of sea snails , marine gastropod mollusks in the family Architectonicidae , the staircase shells or sundials .. Architectonicidae. Architectonicidae. genus. genus. marine. marine ( ocean ). gastropod. gastropod. family. family ( biology )
not_related.