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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,  $ 73,000: price, in bitcoin: payment method, San Francisco public transportation system Muni: victim, November 2016: time) 
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: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: requested for,  $ 73,000: price, in bitcoin: payment method, San Francisco public transportation system Muni: victim, November 2016: time) 