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In order to improve the epidemic control , Secretary for Social Affairs and Culture Chui Sai On , who has been named director of the SARS task force by the government , has designated representatives from the Health Services and the Center for Disease Prevention and Control to visit neighboring Guangdong Province on Thursday , to learn from Guangdong ' s experience and know - how in combating SARS , which have been acknowledged by WHO .
 ( nominate: named,  Chui Sai On: person, government: agent) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( nominate: named,  Chui Sai On: person, government: agent) 