ATHENS (Reuters) - Rebels angered by Greece's international bailout walked out of the leftist Syriza party on Friday, formalising a widely-expected split after leader Alexis Tsipras resigned as prime minister to pave the way for early elections.
Utilize the input text as a context reference, choose the right relationship between 'Syriza' and 'ATHENS' from the options.
Options: headquarters location, creator, parent organization, employer