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Otto Richard Lummer ( July 17 , 1860 – July 5 , 1925 ) was a German physicist and researcher .
 person: Otto; person: Lummer
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: Otto, Lummer 
Answer:
 person: Otto; person: Lummer