With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Keith Urban is a person.
text_B: Cyrtidula is a genus of fungi in the class Dothideomycetes .. Dothideomycetes. Dothideomycetes. genus. genus. fungi. fungus. The relationship of this taxon to other taxa within the class is unknown -LRB- incertae sedis -RRB- .. incertae sedis. incertae sedis. taxon. taxon
not_related.