Take context from the input text and decide on the accurate relationship between 'Syriza' and 'Alexis Tsipras' from the options provided.
Options: employer, operator, distributed by, chairperson

Greece is set to receive the first instalment of its third multi-billion-euro bailout, as Prime Minister Alexis Tsipras mulls whether to hold early elections after the austerity bailout split his radical left Syriza party
chairperson