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Olga Alexandrovna Zherebzova , née Zubova , also known as Madame Gerebtzoff ( , 1766 – 1849 ) , was the sister of the celebrated Zubov brothers , Prince Platon and Counts Nicholas and Valerian .
 Olga, Zubov, Platon, Nicholas, Valerian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olga, Zubov, Platon, Nicholas, Valerian