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 finance chiefs warned that last-ditch talks Saturday on a bailout deal to stop Greece crashing out of the euro would be "extremely difficult", blaming Athens for a collapse of trust.

Answer: currency