With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Adrien Broner was ranked the fifth best at boxing out of all boxers in the world.
text_B: Sleep Well Beast is the upcoming seventh studio album by The National .. The National. The National ( band ). The album will be released on September 8 , 2017 on 4AD .. 4AD. 4AD
not_related.