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A 28 year-old man with chronic hepatitis B was administered interferon-alpha (5 x 10(6) IU) intramuscularly once a day for 28 days.
 potential therapeutic event: administered 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 potential therapeutic event: administered 