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The film 's source , P. D. James ' novel " The Children of Men " ( 1992 ) , describes what happens when society is unable to reproduce , using male infertility to explain this problem .
 person: P. D. James
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: P. D. James 
Answer:
 person: P. D. James