5276
" The U . S . will use military force , unilaterally if necessary , when our core interests demand it . " - Obama . LIVE : http://t.co/f7lZS47Vsx
 U . S ., Obama
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U . S ., Obama