With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: U2 is a metal band.
text_B: Kagin may refer to  :. Edwin Kagin -LRB- 1940 -- 2014 -RRB- , American lawyer. Edwin Kagin. Edwin Kagin. Kagin , Iran , a village
not_related.