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The youngest person to fly in space is Gherman Titov , who was 25 years old when he flew Vostok 2 .
 person: Gherman Titov
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: Gherman Titov 
Answer:
 person: Gherman Titov