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Kandel and his colleagues showed that after habituation from siphon touching ( gill withdrawal response weakened ) , applying a paired noxious electrical stimulus to the tail and a touch to the siphon , gill withdrawal was once again noted .
 person: Kandel
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: Kandel 
Answer:
 person: Kandel