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

"The splintering of the more vehemently 'anti-memorandum' faction of Syriza and the renewed electoral mandate for Prime Minister Alexis Tsipras reduces the immediate political uncertainty that had arisen with the decision to call snap elections," said the Fitch ratings agency, referring to the memorandum of understanding signed for the bailout.
chairperson