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The former First Lord of the Admiralty A.V. Alexander was appointed Minister of Defence on 20 December 1946 and the Ministry of Defence was formally established on 1 January 1947 by the Ministry of Defence Act 1946 .
 Admiralty A.V. Alexander, Defence, Ministry, Defence, Ministry, Defence
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Admiralty A.V. Alexander, Defence, Ministry, Defence, Ministry, Defence