With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Cara Delevingne is not an actress.
text_B: Kopaonik is a village in the municipality of Raska , Serbia .. Raska. Raska, Serbia. village. village. municipality. Municipalities of Serbia. Serbia. Serbia. According to the 2002 census , the village has a population of 18 people .. village. village
not_related.