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The White House has publicly blamed North Korea for a ransomware attack in May that locked more than 300,000 computers in 150 countries .
 ransom: a ransomware attack
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 ransom: a ransomware attack