What is the relationship between 'Eurozone' and 'euro' in the context of the input sentence.
Options: location of formation, founded by, business division, currency

Just seven months into his term, Tsipras lost his majority in parliament after far-left rebels in his party opposed tough new conditions demanded by Eurozone countries for the 86 billion euro rescue package: Hikes in sales and business taxes, changes to public administration and labor laws opposed by unions, and further pension cuts to address the country's dramatically aging population.
currency