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According to the WHO fifty one new therapeutic entities - antibiotics ( including combinations ) , are in phase 1 - 3 clinical trials as of May 2017 .
 organization: WHO
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: WHO 
Answer:
 organization: WHO