Utilize the input text as a context reference, choose the right relationship between Syriza and Athens 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.

Despite the prospect of a confidence vote after some lawmakers from the ruling Syriza party rebelled over a new bailout deal, the Athens stock market was up 0.4 percent, having given up the bulk of earlier gains.

Answer: headquarters_location