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Away to the west are the ruins of Noltland Castle , built by Gilbert Balfour in the 16th century , notable for its massive spiral staircase " second only to Fyvie Castle , while its triple tiers of gunloop s are without parallel in Scotland , if not Europe " .
 person: Gilbert Balfour
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: Gilbert Balfour 
Answer:
 person: Gilbert Balfour