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Euro The following countries use the euro as their de facto currency : United States dollar The following countries use the USD as their de facto currency : Russian ruble The following disputed territories have the Russian ruble as their de facto currency : South African rand and Botswana pula Due to hyperinflation in Zimbabwe in 2006 to 2008 , the government of Zimbabwe has allowed circulation of foreign currency since September 2008 and local currency became obsolete since 12 April 2009 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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