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When Moffat took over Davies ' duties as executive producer , he began expanding on the character 's background , depicting adventures earlier in River 's timeline , upgrading Alex Kingston from a guest star to a recurring actor in the series .
 person: Moffat; person: Davies; person: Alex Kingston
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: Moffat, Davies, Alex Kingston 
Answer:
 person: Moffat; person: Davies; person: Alex Kingston