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Rantel 's area of professional specialization was mostly in radio format s targeted at young-adult audiences as measured by Arbitron of Columbia , MD .
 Rantel, Arbitron, Columbia , MD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rantel, Arbitron, Columbia , MD