32821
By the 1920 s , the emerging middle and working classes were powerful enough to elect a reformist president , Arturo Alessandri , whose program was frustrated by a conservative congress .
 person: Arturo Alessandri
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: Arturo Alessandri 
Answer:
 person: Arturo Alessandri