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Service The 1st Maryland Infantry , Potomac Home Brigade was organized at Frederick , Maryland beginning August 15 , 1861 and mustered in on December 13 , 1861 for three years under the command of Colonel Roger E. Cook .
 organization: 1st Maryland; organization: Potomac Home Brigade; location: Frederick , Maryland
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: 1st Maryland, Potomac Home Brigade, Frederick , Maryland 
Answer:
 organization: 1st Maryland; organization: Potomac Home Brigade; location: Frederick , Maryland