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The United States ’ National Security Agency has linked North Korea to the WannaCry ransomware attack that had affected more than 3,00,000 people worldwide in May , reported The Washington Post .
 North Korea: attacker; people: victim; May: time
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 North Korea: attacker; people: victim; May: time