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

PT5M5S 620 349 Autoplay On Off Video feedback Video settings ﻿ PM Alexis Tsipras faces Syriza mutiny Eurozone clinches deal with Greece Marousi: Business has been so brisk in the giant Kotsovolos appliance and electronics store in this upper-middle-class suburb of Athens that you might think a sale was on.
chairperson