37792
Suppose we have a source that emits electron–positron pairs , with the electron sent to destination " A " , where there is an observer named Alice , and the positron sent to destination " B " , where there is an observer named Bob .
 person: Alice; person: Bob
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: Alice, Bob 
Answer:
 person: Alice; person: Bob