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The Guinness editors do their best to stay away from politics , though we do learn that Iran has the '' youngest voting age '' -LRB- 15-year-olds can cast ballots -RRB- , that Fidel Castro is the '' longest serving head of state '' and that Italy 's Silvio Berlusconi is the '' richest prime minister , '' having amassed '' a personal wealth of $ 10 billion , according to Forbes . ''
 Silvio Berlusconi, 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