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The first discovery of electromagnetic radiation other than visible light came in 1800 , when William Herschel discovered infrared radiation .
 person: William Herschel
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 Herschel 
Answer:
 person: William Herschel