Analyze the relationship between 'Syriza' and 'Alexis Tsipras' within the context of the input sentence.
Options: employer, original broadcaster, chairperson, publisher

Other Articles Capital infusion of Rs 20,000 cr likely by Sept: Banking Secretary Capital infusion of Rs 25,000 crore a good beginning: Raghuram Rajan After uproar, government ups budget for social welfare Greek Prime Minister Alexis Tsipras has defeated a bid by dissenters in his left-wing Syriza party to push for an end to bailout talks and an exit from the euro currency.
chairperson