With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London does not have healthcare.
text_B: Donald K. Walker -LRB- born January 4 , 1980 -RRB- is an American mixed martial artist , who is perhaps best known for his two fight stint in the Bantamweight division of the Ultimate Fighting Championship .. American. United States. Bantamweight. Bantamweight ( MMA ). mixed martial artist. mixed martial artist. Ultimate Fighting Championship. Ultimate Fighting Championship
not_related.