Utilize the input text as a context reference, choose the right relationship between eurozone and euro from the options. Options: 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.

Predictions of a close result were proved badly wrong from the start of counting on Sunday night with around 60 per cent of Greek voters ignoring warnings about their country's membership of the euro and backing the 'No' campaign against five years of unpopular economic reforms imposed by Greece's eurozone creditors.

Answer: currency