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At the signing , Ribbentrop and Stalin enjoyed warm conversations , exchanging toasts and further discussing the prior hostilities between the countries in the 1930s .
 person: Ribbentrop
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: Ribbentrop 
Answer:
 person: Ribbentrop