Greek Prime Minister Alexis Tsipras had urged his fellow members of parliament to vote 'yes' and survived despite up to 42 rebel votes or abstentions from his Syriza party's MPs, including a 'no' vote from former finance minister Yannis Varoufakis.
Take context from the input text and decide on the accurate relationship between 'Syriza' and 'Alexis Tsipras' from the options provided.
Options: chairperson, business division, chief executive officer, publisher