With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Toxicity can cause Extreme environments.
text_B: Rodolphe William Seeldrayers -LRB- December 16 , 1876 -- October 7 , 1955 -RRB- was the 4th President of FIFA -LRB- Federation Internationale de Football Association -RRB- , serving from 1954 to 1955 .. 4th President of FIFA. List of Presidents of FIFA. Federation Internationale de Football Association. FIFA. He was actively involved in the official associations of Belgium sports .. Belgium. Belgium
not_related.