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For example , the Vienna U-Bahn metro signals train drivers to wait briefly , by operating a special white light signal triggered by the approach of an interchange train on another track .
 location: Vienna U-Bahn
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Vienna U-Bahn 
Answer:
 location: Vienna U-Bahn