What is the relationship between eurozone and euro in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

If, under the worse-case scenario, Greece were to lose the support of the European Union and European Central Bank, default on more of its debts and gradually slide out of the eurozone , the country may have to drop the euro as it is currently used in favour of Greek euros, or reintroduce the "drachma", calling it "new drachma".

Answer: currency