Greek Prime Minister Alexis Tsipras is trying to turn a corner after he reluctantly agreed to negotiate a third bailout, allowing the European Central Bank to top up bank credit lines but prompting a rebellion in his leftist Syriza party.
Utilize the input text as a context reference, choose the right relationship between 'Syriza' and 'Alexis Tsipras' from the options.
Options: subsidiary, distributed by, member of, chairperson