With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Greenland shark is in the Somniosidae genus.
text_B: The Somniosidae are a family of sharks in the order Squaliformes , commonly known as sleeper sharks .. Squaliformes. Squaliformes. The common name `` sleeper shark '' comes from their apparent slow swimming , low activity level , and perceived non-aggressive nature .. shark. shark
related.