14945
Because psoralens sensitize skin to ultraviolet A light , phototoxic reactions are the most frequent adverse effect of this treatment .
 phototoxic reactions, psoralens
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:
 phototoxic reactions, psoralens