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Sudhanshu Sharma ( born 19 February 1969 ) referred to as Dr. Sudhanshu is an Indian educationist and polymath : geologist , writer , thinker , politician , photographer , environmentalist .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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