With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Psychology is a science.
text_B: 2011 Archery European Indoor Championships is 13th edition of European Indoor Championships in Archery which was held in Cambrils , Spain between 21 -- 27 March 2011 .. Cambrils. Cambrils. Spain. Spain
not_related.