With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London has a mayor.
text_B: Olinda Cho Yu Yen -LRB- ; born May 24 , 1980 -RRB- is a Singapore Idol Season 1 finalist .. Singapore. Singapore. Singapore Idol. Singapore Idol. She was the competition 's second runner-up , behind Sylvester Sim and Taufik Batisah .. Sylvester Sim. Sylvester Sim. Taufik Batisah. Taufik Batisah. She has lost a tremendous amount of weight , probably due to her slimming advertising contract .. Her debut album was supposed to be released on September 2006 , but it was pushed back for more than a year to October 2007 .
not_related.