The new "preliminary draft" analysis of Greece's finances highlighted the deterioration that has taken place since Prime Minister Alexis Tsipras and his anti-austerity Syriza party took power at the beginning of 2015.
Refer to the input text as context and select the correct relationship between 'Syriza' and 'Alexis Tsipras' from the available options.
Options: manufacturer, developer, chairperson, founded by