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Members of the Legislative Yuan questioned Ma 's decision , as Chen had previously been a U.S. citizen and had also obtained a U.S. green card again for a short period while serving on the Supreme Court ( see personal life , below ) .
 person: Ma
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: Ma 
Answer:
 person: Ma