With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Empress Ki is a person.
text_B: The 2002 Singapore Open in badminton was a four-star tournament held in Singapore , from August 19 to August 25 , 2002 .. Singapore Open. Singapore Open ( badminton ). badminton. badminton. Singapore. Singapore
not_related.