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The vulnerability has been the center of attention in recent days , following the outbreak of the global “ Wan na Cry ” ransomware attack that crippled Britain ’s hospital system and has spread to at least 150 countries .
 ( ransom: “ Wan na Cry ” ransomware attack,  hospital system: victim, Britain: victim) 
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: “ Wan na Cry ” ransomware attack,  hospital system: victim, Britain: victim) 