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EOC 's main customer in its early years was the British Government , but the Government abandoned " Armstrong guns " in the mid-1860s due to dissatisfaction with Armstrong 's breech mechanism , and instead built its own rifled muzzle-loaders at Woolwich Arsenal ( " Woolwich guns " ) until 1880 .
 person: Armstrong; person: Armstrong
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: Armstrong, Armstrong 
Answer:
 person: Armstrong; person: Armstrong