Greek Prime Minister Alexis Tsipras on Wednesday faced down a major mutiny in his radical left Syriza party and violent protests in the streets of Athens to win parliamentary approval for the draconian reforms demanded in return for a new 86-billion-euro bailout package.
In the context of the input sentence, determine the relationship between 'Syriza' and 'Athens'.
Options: location of formation, manufacturer, headquarters location, business division