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November 2016 , San Francisco public transportation system Muni was hacked and requested for a $ 73,000 ransom in bitcoin to get back encrypted data .
 ransom: requested for
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: requested for