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Another important development for the city has been the Copenhagen Metro , the railway system which opened in 2002 with additions until 2007 , transporting some 54 " million passengers by 2011 .
 location: Copenhagen Metro
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: Copenhagen Metro 
Answer:
 location: Copenhagen Metro