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Marga obtained a PhD in Mathematics and Physics ( 1941 ) and went on to teach Chemistry and Physics in the Mater Dei High School for girls between 1932 and 1949 in NijmegenIn 1942 , Marga also started to study Medicine at the University of Utrecht , but when the Second World War broke out the University was closed .
 Marga, Marga
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marga, Marga