Utilize the input text as a context reference, choose the right relationship between 'Syriza' and 'Athens' from the options.
Options: chief executive officer, headquarters location, developer, operator

The Athens General Index (.ATG) has fluctuated sharply this year, which has seen left-wing Prime Minister Alexis Tsipras's newly elected Syriza government wrangle with European Union and International Monetary Fund lenders in bitter bailout talks.
headquarters location