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( Text ) Sofia , February 15 ( BTA ) -- Today the two main political forces in Bulgaria , the Bulgarian Socialist ( formerly Communist ) Party ( BSP ) and the Union of Democratic Forces ( SDS ) announced their stand on the possible airstrikes in Bosnia five days before the expiry of NATO 's ultimatum .
 BTA, Sofia; Bulgarian Socialist ( formerly Communist ) Party, Bulgaria; BSP, Bulgaria; Union of Democratic Forces, Bulgaria; SDS, Bulgaria
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: Organization based in, Located in, Live in, Work for, Kill 
Text: {0} 
Answer:
 BTA, Sofia; Bulgarian Socialist ( formerly Communist ) Party, Bulgaria; BSP, Bulgaria; Union of Democratic Forces, Bulgaria; SDS, Bulgaria