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Gertrud Pålson-Wettergren ( 17 February 1897 - 26 November 1991 ) was a Swedish mezzosoprano .
 Gertrud Pålson-Wettergren
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gertrud Pålson-Wettergren