With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Facebook expanded to Ivy League schools.
text_B: Marasmarcha brevirostris is a species of moth in the genus Marasmarcha , known from Guatemala , Mexico , and Panama .. moth. moth. Marasmarcha. Marasmarcha. Guatemala. Guatemala. Mexico. Mexico. Panama. Panama. Moths in this species take flight in February and August , and have a wingspan of approximately 20 -- 25 millimetres .
not_related.