With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George Foreman is a two-time world heavyweight champion.
text_B: Roger William Riehl -LRB- December 25 , 1935 -- February 16 , 2005 -RRB- was an American inventor noted for his work in electronics -- in particular , the `` Synchronar ''  : the first solar-powered wristwatch .. electronics. electronics. solar-powered. solar power. wristwatch. wristwatch
not_related.