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American units advancing west of Basra have already secured the Rumeila oil field , whose daily output of 1 . 3 million barrels makes it Iraq ' s most productive .
 American, Basra, Iraq, American units advancing west of Basra, the Rumeila oil field, whose, it, Iraq ' s most productive
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 American, Basra, Iraq, American units advancing west of Basra, the Rumeila oil field, whose, it, Iraq ' s most productive