297783
He was the valedictorian of Mainland High School class of 1999 .
 organization: Mainland High School
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: Mainland High School 
Answer:
 organization: Mainland High School