48081
When the Bobo doll experiment was repeated later in 1990 , researchers found that children who were playing with a Bobo doll for the first time in their lives were up to five times more likely of imitating aggressive behavior compared to children who have been previously exposed to one before .
 None
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:  
Answer:
 None