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At St. Petersburg one of his students was Ivan Pavlov ( 1849 – 1936 ) .
 location: St. Petersburg; person: Ivan Pavlov
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: St. Petersburg, Ivan Pavlov 
Answer:
 location: St. Petersburg; person: Ivan Pavlov