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Chromium ( III ) chloride has also been used as a Lewis acid in organic reactions , for example to catalyse the nitroso Diels-Alder reaction .
 person: Diels-Alder
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: Diels-Alder 
Answer:
 person: Diels-Alder