With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Down syndrome is a medical condition caused by abnormal DNA.
text_B: Anarsia luticostella is a moth in the family Gelechiidae .. Gelechiidae. Gelechiidae. Anarsia. Anarsia. moth. moth. It was described by Chretien in 1915 .. Chretien. Pierre Chretien. It is found in Algeria .. Algeria. Algeria
not_related.