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When five former Olympic 100 champions from 1948 to 1980 , who have been invited to watch the race , turned up at a news conference on Thursday , Christie was quick to put his autograph book in front of the them .
 Christie, Olympic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Christie, Olympic