11820
However , after his study of the philosophy of mathematics , he abandoned epistemological idealism for Gottlob Frege 's conceptual realism .
 person: Gottlob Frege
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: Gottlob Frege 
Answer:
 person: Gottlob Frege