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Wolfgang Gerhardt ( born December 31 , 1943 in Ulrichstein ) is a German politician and was the leader of the FDP from 1995 until he was succeeded by Guido Westerwelle in 2001 .
 Wolfgang Gerhardt, Ulrichstein, FDP, Guido Westerwelle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Wolfgang Gerhardt, Ulrichstein, FDP, Guido Westerwelle