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Martin van Creveld described him as " the most competent human being who ever lived " .
 person: Martin van Creveld
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: Martin van Creveld 
Answer:
 person: Martin van Creveld