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British Chancellor of the Exchequer Gordon Brown on Tuesday named the current head of the country ' s energy regulator as the new chairman of finance watchdog the Financial Services Authority ( FSA ).
 head: person
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: nominate 
  Option: person, agent 
Text: {0} 
Answer:
 head: person