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The Arboretum officially opened to the public in 1976 and today has one of the most significant collections of azaleas and rhododendrons in the country .
 organization: Arboretum
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: Arboretum 
Answer:
 organization: Arboretum