With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Rihanna has sales exceeding 230 million records worldwide.
text_B: The Men 's under-23 road race of the 2016 UCI Road World Championships took place in Doha , Qatar , on October 13 , 2016 .. 2016 UCI Road World Championships. 2016 UCI Road World Championships. Doha. Doha. Qatar. Qatar. The course of the race was 166 km .
not_related.