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After 1869 , Dmitri Mendeleev proposed his periodic table placing oxygen at the top of " group VI " above sulfur , selenium , and tellurium .
 Dmitri Mendeleev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dmitri Mendeleev