Utilize the input text as a context reference, choose the right relationship between 'Syriza' and 'Alexis Tsipras' from the options.
Options: position held, chairperson, brand, platform

In Athens, Prime Minister Alexis Tsipras and his inner circle debated whether to take on anti-bailout rebels within his own radical left Syriza party by calling a parliamentary confidence vote or to go straight to early elections.
chairperson