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Since taking office , the Obama administration has changed the stance of the United States regarding the proposed United Nations treaty on trade in small arms from strong opposition to support for the treaty if passed by " consensus , " although it maintains a list of so-called " redlines " that it considers unacceptable including restrictions on the Second Amendment or " civilian possession or trade of firearms otherwise permitted by law or protected by the U.S. Constitution , " as well as attempts to regulate trade in ammunition .
 person: Obama
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: Obama 
Answer:
 person: Obama