Refer to the input text as context and select the correct relationship between 'Syriza' and 'Alexis Tsipras' from the available options.
Options: director/manager, chairperson, distributed by, member of

Greek voters overwhelmingly rejected international creditors' tough bailout terms Sunday, but premier and Syriza leader Alexis Tsipras insisted the result does not mean a "rupture" with Europe despite fears it will end in a "Grexit" from the eurozone.
chairperson