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He reappointed Paul Volcker as Chairman of the Federal Reserve , and in 1987 he appointed monetarist Alan Greenspan to succeed him .
 person: Paul Volcker; organization: Federal Reserve; person: Alan Greenspan
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: Paul Volcker, Federal Reserve, Alan Greenspan 
Answer:
 person: Paul Volcker; organization: Federal Reserve; person: Alan Greenspan