Take context from the input text and decide on the accurate relationship between 'Syriza' and 'Alexis Tsipras' from the options provided.
Options: developer, chairperson, brand, product/material produced

Those who want to accept the bailout terms and turn the clock back 12 months will be disappointed — if Greece votes "Yes" Alexis Tsipras will still be Prime Minister, and Syriza currently has no plausible opposition.
chairperson