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More than four million people voted in Italy 's first nationwide primary and made Romano Prodi , a former prime minister , the overwhelming choice of the center-left to challenge Prime Minister Silvio Berlusconi in the next general election .
 nationality: Silvio Berlusconi, Italy; nationality: Romano Prodi, Italy
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  Silvio Berlusconi, Italy; Romano Prodi, Italy 
Answer:
 nationality: Silvio Berlusconi, Italy; nationality: Romano Prodi, Italy