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Causes Most people attributed the ammunition shortage to reaction of gun owners and other groups to the election of U.S. President Barack Obama , claiming that these people fear more restrictive gun laws , ammunition taxes , and social decay .
 person: Barack 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: Barack Obama 
Answer:
 person: Barack Obama