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Federal Reserve Chairman Ben Bernanke testifies before U . S . Congress , watch live : http://t.co/ovtWA2MXOK
 Ben Bernanke, U . S . Congress
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ben Bernanke, U . S . Congress