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After the 1774 incident known as the Powder Alarm , an angry mob surrounded the Brattle mansion and forced the family to flee to Boston .
 person: Brattle
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: Brattle 
Answer:
 person: Brattle