With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rachel McAdams was in a drama.
text_B: Nicaragua competed at the 2015 World Championships in Athletics in Beijing , China , from 22 to 30 August 2015 .. Beijing. Beijing. Nicaragua. Nicaragua. 2015 World Championships in Athletics. 2015 World Championships in Athletics. China. China
not_related.