What is the relationship between Syriza and Alexis Tsipras in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

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.

Answer: chairperson