ATHENS (Reuters) - Former Prime Minister Antonis Samaras announced he was stepping down as leader of Greece's conservative New Democracy opposition party after a strong vote for the 'No' position backed by the leftwing government in Sunday's referendum.
Utilize the input text as a context reference, choose the right relationship between 'New Democracy' and 'Antonis Samaras' from the options.
Options: chairperson, industry, member of, currency