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HMS Elk was a 482 ton displacement , 16 gun Acorn-class brig-sloop of the Royal Navy launched on 29 September 1847 from the Chatham Dockyard .
 organization: Royal Navy
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: Royal Navy 
Answer:
 organization: Royal Navy