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He joined Grenfell Baines & Hargreaves in 1959 as Associate Partner to open its first London office ; this office initially operated out of Rock 's flat in Earls Court .
 person: Grenfell Baines; person: Rock
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: Grenfell Baines, Rock 
Answer:
 person: Grenfell Baines; person: Rock