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Furthermore , the strongest of his possible contenders , Pier Luigi Bersani , which polls showed as having a 50 % support in center-north regions , withdrew to avoid a ' confusing candidacy ' .
 person: Pier Luigi Bersani
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Pier Luigi Bersani