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The film 's opening vignette , a namesake of the future director 's 1948 film , Secret Beyond the Door , takes place in 1900 Vienna , as Fritz Lang ( 1890 – 1976 ) accidentally discovers , at the age of 10 , that his mother who , to spare her children the burden of antisemitism , had converted to Catholicism that year , is Jew ish .
 Vienna, Fritz Lang
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vienna, Fritz Lang