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Although retinoic acid is well tolerated by the majority of patients with this disease , a potentially fatal complication of this kind of treatment has been reported : " the retinoic acid syndrome " .
 fatal complication, retinoic acid; retinoic acid syndrome, retinoic acid
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 fatal complication, retinoic acid; retinoic acid syndrome, retinoic acid