2737
Flutamide withdrawal syndrome is characterized by a decrease in prostate-specific antigen (PSA) after flutamide withdrawal in a subset of patients with progressing metastatic carcinoma of the prostate.
 adverse event: withdrawal 
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: withdrawal 