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It starred Luke Treadaway as Christopher , Nicola Walker as his mother Judy , Paul Ritter as his father Ed , Una Stubbs as Mrs. Alexander and Niamh Cusack as Siobhan .
 person: Luke Treadaway; person: Nicola Walker; person: Paul Ritter; person: Una Stubbs; person: Niamh Cusack
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: Luke Treadaway, Nicola Walker, Paul Ritter, Una Stubbs, Niamh Cusack 
Answer:
 person: Luke Treadaway; person: Nicola Walker; person: Paul Ritter; person: Una Stubbs; person: Niamh Cusack