91617
He ran only five races in the series in 1998 , as he attempted to make his debut at the top level of NASCAR competition , the Winston Cup Series ; he failed to qualify for a number of races through the season , before making his debut , in what would prove to be his only start in the series , in the Pepsi 400 in October .
 NASCAR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 NASCAR