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The 1970 U.S. Professional Indoor was a WCT tennis tournament played on indoor carpet courts .
 organization: WCT
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: WCT 
Answer:
 organization: WCT