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Although Sir John Kotelawala was expected to succeed him , his son Dudley Senanayake , Minister of Agriculture was appointed Prime Minister on 26 March 1952 by the Governor-General Lord Soulbury .
 John Kotelawala, Dudley Senanayake, Soulbury
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 John Kotelawala, Dudley Senanayake, Soulbury