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While preparing for an evening lecture on 21 April 1820 , Hans Christian Ørsted made a surprising observation .
 person: Hans Christian Ørsted
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: Hans Christian Ørsted 
Answer:
 person: Hans Christian Ørsted