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In the past the monarch has occasionally had to make a judgement , as in the appointment of Alec Douglas-Home in 1963 when it was thought that the incumbent Prime Minister , Harold Macmillan , had become ill with terminal cancer .
 Alec Douglas-Home, Harold Macmillan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alec Douglas-Home, Harold Macmillan