With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Toronto is the least populous city in Canada.
text_B: Heteropsis obscura is a butterfly in the Nymphalidae family .. Nymphalidae. Nymphalidae. Heteropsis. Heteropsis ( butterfly ). butterfly. butterfly. It is found on Madagascar .. Madagascar. Madagascar. The habitat consists of forests .
not_related.