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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 " .
 adverse effect: fatal complication, retinoic acid; adverse effect: retinoic acid syndrome, retinoic acid
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 adverse effect: fatal complication, retinoic acid; adverse effect: retinoic acid syndrome, retinoic acid