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Leeds Teaching Hospitals NHS Trust reported four ransomware attacks in 2016 , and University Hospitals Bristol NHS Foundation Trust and Kings College Hospital NHS Foundation Trust sustained three ransomware attacks each last year .
 ransom: ransomware attacks
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: ransomware attacks