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Slawomir Skrzypek the president of the  Polish National Bank  told reporters in Nice that it was good to start thinking of a possible date to swap  Poland  's zloty for the euro but 2011 it's hard to say .
 country of headquarters: Polish National Bank, Poland
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 country of headquarters: Polish National Bank, Poland