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Family Son of former Prime Minister of the Netherlands Willem Drees , he was member of the Labour Party from 1946 until 1970 when he entered politics as Party leader of the new Democratic Socialists '70 , a relatively right-wing split from the Labour Party .
 person: Willem Drees; organization: Labour Party; organization: Democratic Socialists '70; organization: Labour Party
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 Drees, Labour Party, Democratic Socialists '70, Labour Party 
Answer:
 person: Willem Drees; organization: Labour Party; organization: Democratic Socialists '70; organization: Labour Party