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They had five children ; four girls and one son Willem B. Drees the third child became a philosopher .
 person: Willem B. Drees
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: Willem B. Drees 
Answer:
 person: Willem B. Drees