Refer to the input text as context and select the correct relationship between 'Syriza' and 'Alexis Tsipras' from the available options.
Options: business division, chairperson, distribution format, member of

Prime Minister Alexis Tsipras was heavily reliant on support from the opposition in getting the vote to pass, following dissent from radical left hardliners within the governing Syriza party.
chairperson