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Until Basra , U . S . and British troops had encountered little resistance , even when they seized nearby Umm Qasr , and moved to secure key oil fields .
 Basra, U . S, British, nearby Umm Qasr, U . S . and British troops, they, key oil fields
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:
 Basra, U . S, British, nearby Umm Qasr, U . S . and British troops, they, key oil fields