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Watch Live : Trayvon Martin ’ s father , at a hearing in D . C . , addresses the Congressional Caucus on Black Men and Boys http://t.co/ovtWA2MXOK
 Trayvon Martin, D . C ., Congressional Caucus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Trayvon Martin, D . C ., Congressional Caucus