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Masculinization of a female fetus occurred in 5 of 39 (12.8%) exposed to norethisterone; all were cases of clitoral hypertrophy not requiring surgical treatment.
 adverse event: exposed 
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: exposed 