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He was a grandson of the ninth president , William Henry Harrison , creating the only grandfathergrandson duo to have held the office .
 person: William Henry Harrison
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: William Henry Harrison 
Answer:
 person: William Henry Harrison