80159
According to Karl Marx , the father of " scientific socialism " , religion is a tool used by the ruling classes whereby the masses can shortly relieve their suffering via the act of experiencing religious emotions .
 person: Karl Marx
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: Karl Marx 
Answer:
 person: Karl Marx