With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Doctor Doom is the leader of the fictional nation of Latveria.
text_B: Greyia flanaganii is a species of plant in the Melianthaceae family .. Melianthaceae. Melianthaceae. Greyia. Greyia. plant. plant. It is endemic to South Africa .. endemic. Endemism. South Africa. South Africa
not_related.