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Professional career Sirott began his career in radio as a summer vacation fill-in disc jockey for WBBM-FM in 1971 before moving to WLS ( AM ) in 1973 .
 Sirott
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sirott