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Margarethe Siems ( 20 December 1879 – 13 April 1952 ) was a German operatic soprano and voice teacher .
 person: Margarethe Siems
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: Margarethe Siems 
Answer:
 person: Margarethe Siems