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.

The euro edged down against the dollar after Athens failed to service its debt to the International Monetary Fund, and analysts warned of continued uncertainty, even after Greeks vote in a weekend referendum, which is effectively a poll on eurozone membership.

Answer: currency