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It is headed by a Board of directors that is now chaired by Dennis Ross , the special adviser for the Persian Gulf Southwest Asia in U.S. President Barack Obama 's administration .
 person: Dennis Ross; 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: Dennis Ross, Barack Obama 
Answer:
 person: Dennis Ross; person: Barack Obama