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The St. Anne-Mayo grade has four categories of tumors : WHO grading The World Health Organization ( WHO ) grading system is contained in the volume Histological Typing of Tumours of the Central Nervous System , whose first edition dates back to 1979 , the second to 1993 and last one to 2007 .
 organization: Health Organization
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: Health Organization 
Answer:
 organization: Health Organization