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The underlying concept was first expounded upon in 1976 by the management theorist Peter Drucker , who argued that pension funds could reconcile employees ' need for financial security with capital 's need to be mobile and diversified , referring to this development as " pension fund socialism " .
 person: Peter Drucker
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Peter Drucker 
Answer:
 person: Peter Drucker