197137
Nerva became Emperor at the age of sixty-five , after a lifetime of imperial service under Nero and the rulers of the Flavian dynasty .
 person: Nerva; person: Nero
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: Nerva, Nero 
Answer:
 person: Nerva; person: Nero