9293
The perfect point image in the presence of diffraction had already been described by Airy , as early as 1835 .
 person: Airy
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: Airy 
Answer:
 person: Airy