question: Hvem fik en junior verdensrekord på verdensmesterskabet?
context: List of world junior records in athletics
  Verdensrekorder i atletik bliver ratificeret af det internationale atletikforbund. Rekorderne i atletik omfatter en atlets bedste præstation inden det år, hvor han eller hun fylder 20 år. Teknisk set beregnes alderen i alle aldersgrupper under 20 år "den 31. december i konkurrenceåret" for at undgå, at der skiftes aldersgruppe i løbet af en konkurrencesæson.
context_en: List of world junior records in athletics
  World Junior Records in the sport of athletics are ratified by the International Association of Athletics Federations. Athletics records comprise the best performance of an athlete before the year of their 20th birthday. Technically, in all under 20 age divisions, the age is calculated "on December 31 of the year of competition" to avoid age group switching during a competitive season.
title_en: List of world junior records in athletics