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The opening day of the offensive ( 1 July 1916 ) was the bloodiest day in the history of the British Army , suffering 57,470 casualties , including 19,240 dead .
 organization: British Army
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: British Army 
Answer:
 organization: British Army