ATHENS (Reuters) - Greek Prime Minister Alexis Tsipras contained a rebellion in his left-wing Syriza party to win parliamentary approval on Thursday for a second package of reforms required to start talks on a financial rescue deal.
Take context from the input text and decide on the accurate relationship between 'Syriza' and 'Alexis Tsipras' from the options provided.
Options: chairperson, manufacturer, legal form, subsidiary