Greece's voters decisively rejected international creditors' tough bailout terms Sunday, but Greek premier and Syriza leader Alexis Tsipras insisted the result does not mean a "rupture" with Europe despite fears it will end in a "Grexit" from the eurozone.
In the context of the input sentence, determine the relationship between 'Syriza' and 'Alexis Tsipras'.
Options: distributed by, chairperson, owner of, stock exchange