What is the relationship between Syriza and ATHENS 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.

ATHENS Aug 5 (Reuters) - The parliamentary spokesman for Greece's ruling Syriza party urged it on Wednesday to unite behind a new funding agreement, saying the country wanted a full bailout immediately rather than a bridge loan.

Answer: headquarters_location