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The city continued those operations under the name Denver Metro Transit until 1974 , when they were assumed by the voter-approved Regional Transportation District ( RTD ) .
 location: Denver; organization: Regional Transportation District
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: Denver, Regional Transportation District 
Answer:
 location: Denver; organization: Regional Transportation District