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The cardinal electors eligible to participate at the 2013 papal conclave are those under the age of 80 before the resignation of Pope Benedict XVI took effect on 28 February 2013 .
 Pope Benedict XVI
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pope Benedict XVI