2270
A 71-year-old man, who had a history of a previous bullous drug reaction to a sulfonamide, began receiving an ophthalmic preparation that contained sulfacetamide sodium.
 adverse event: reaction 
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:
 adverse event: reaction 