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Mountbatten served his final posting at the Admiralty as First Sea Lord and Chief of the Naval Staff from April 1955 to July 1959 , the position which his father had held some forty years before .
 person: Mountbatten; organization: Admiralty
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: Mountbatten, Admiralty 
Answer:
 person: Mountbatten; organization: Admiralty