Analyze the relationship between 'Syriza' and 'Alexis Tsipras' within the context of the input sentence.
Options: product/material produced, chairperson, brand, developer

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