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Kingdom of Silver & Keepsake is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who .
 organization: Big Finish Productions
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: Big Finish Productions 
Answer:
 organization: Big Finish Productions