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In the year 69 Trebonius Gallus , became an ally to Otho and helped him to assassinate the then Roman Emperor Galba .
 person: Trebonius Gallus; person: Otho; person: Galba
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: Trebonius Gallus, Otho, Galba 
Answer:
 person: Trebonius Gallus; person: Otho; person: Galba