With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Thor: The Dark World got mixed reviews on Rotten Tomatoes.
text_B: Hernan Marquez Beltran -LRB- born September 4 , 1988 -RRB- , commonly known by his nickname `` Tyson '' Marquez , is a Mexican professional boxer .. Tyson. Mike Tyson. professional boxer. professional boxer. He held the WBA flyweight title from 2011 to 2012 , and has challenged once for the WBA interim super flyweight title in 2010 .. WBA. World Boxing Association. flyweight. flyweight. interim. interim championship. super flyweight. super flyweight. Marquez is known for his trilogy of fights against Luis Concepcion , whom he defeated twice in 2011 and lost to in 2015 .. Luis Concepcion. Luis Concepcion
not_related.