1670
According to Schopenhauer 's " On the Fourfold Root of the Principle of Sufficient Reason " , there are four distinct forms of the principle .
 person: Schopenhauer
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: Schopenhauer 
Answer:
 person: Schopenhauer