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Italy 's high-decibel elections cleaved the nation , ending in so tight a race that it was impossible to tell half a day after the polls closed whether Prime Minister Silvio Berlusconi or his center-left challenger , Romano Prodi , had won .
 Silvio Berlusconi, Italy; Romano Prodi, Italy
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Silvio Berlusconi, Italy; Romano Prodi, Italy