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.

Eurozone leaders and officials -- some of whom viewed the plebiscite as an in-out vote on Greece's membership in the euro -- scrambled to work out their response.

Answer: currency