0905 : Far-left members of Greece's ruling Syriza party have revealed plans to form a splinter party, Popular Unity, following the resignation of Prime Minister Alexis Tsipras and calling of snap elections overnight.
Analyze the relationship between 'Syriza' and 'Alexis Tsipras' within the context of the input sentence.
Options: product/material produced, chairperson, chief executive officer, employer