With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The blue-ringed octopus is a marine animal.
text_B: The Ploucnice -LRB- Polzen -RRB- is a river in the Czech Republic .. Czech Republic. Czech Republic. It is a tributary of the Labe , which it flows into in Decin .. tributary. tributary. Labe. Labe River. Decin. Decin
not_related.