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A study conducted by the Pew Research Center found that about 16 % of the world 's people , the third largest group after Christianity and Islam , have no religious affiliation .
 organization: Pew Research Center
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Pew Research Center 
Answer:
 organization: Pew Research Center