Take context from the input text and decide on the accurate relationship between 'New Democracy' and 'Antonis Samaras' from the options provided.
Options: chairperson, member of, industry, currency

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.
chairperson