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Televised pre-race activities were scheduled to start at 6:30 PM US EDT , with the radio broadcast of the race handled by Sirius Satellite Radio via MRN , starting at 7:15 PM US EDT .
 Sirius Satellite Radio, MRN
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sirius Satellite Radio, MRN