Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Usain Bolt is no longer listed to run the 100 metres at Jamaica's national senior trials on Thursday, sparking concerns about his fitness ahead of defending his sprint titles at this year's world championships in Beijing. The 100m and 200m world record holder has struggled for form this year with modest best times of 10.12 seconds in Brazil and 20.13 in Ostrava. The 10-times world championship medallist, who expressed concerns after a pedestrian 20.29 to win the 200m at the recent New York Diamond League meeting, had intended to run at the Jamaican trials as he seeks race sharpness. But Bolt's name was missing from a list of athletes for the 100m released by the Jamaica Athletics Administrative Association (JAAA) late on Wednesday.Six-time Olympic gold medallist Usain Bolt has struggled for form this yearBolt had intended to run at Jamaican trials in bid to rediscover sharpnessHowever, Bolt is no longer listed to run at Thursday's national trials 
 Question:_ had been entered along with Yohan Blake, Asafa Powell and Nesta Carter in the preliminary list published by the JAAA on Sunday.
Output:
Usain Bolt