With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gianluigi Buffon won a competition in 1999.
text_B: Manica is a genus of ants within the subfamily Myrmicinae .. Myrmicinae. Myrmicinae. genus. genus. subfamily. subfamily. To date it contains six known species .
not_related.