Refer to the input text as context and select the correct relationship between 'New Democracy' and 'Antonis Samaras' from the available options.
Options: chairperson, manufacturer, developer, distributed by

The conservative New Democracy party has only an interim leader after former prime minister Antonis Samaras quit as party chief in July after Greeks overwhelmingly supported Tsipras's call to reject an EU bailout at a referendum.
chairperson