Refer to the input text as context and select the correct relationship between 'Syriza' and 'Alexis Tsipras' from the available options.
Options: platform, chairperson, member of, creator

Associated Press ATHENS, Greece (AP) - The official projection of final results in Greece's early election shows the left-wing Syriza party of former Prime Minister Alexis Tsipras winning with 35.5 percent, but falling short of enough parliamentary seats to form a government on its own.
chairperson