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Italian astronomer Galileo Galilei was the first to record an observation of Io on January 8 , 1610 , though Simon Marius may have also observed Io at around the same time .
 person: Galileo Galilei; person: Simon Marius
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: Galileo Galilei, Simon Marius 
Answer:
 person: Galileo Galilei; person: Simon Marius