Utilize the input text as a context reference, choose the right relationship between Syriza and Alexis Tsipras from the options. Options: 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.

Those who want to accept the bailout terms and turn the clock back 12 months will be disappointed — if Greece votes "Yes" Alexis Tsipras will still be Prime Minister, and Syriza currently has no plausible opposition.
chairperson