6113
Given that discontinuation of nitrofurantoin and introduction of methylprednisolon therapy significantly lowered liver enzyme levels , restoring most of them to normal , we concluded that this was probably the case of toxic liver damage caused by nitrofurantoin .
 toxic liver damage, nitrofurantoin
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:
 toxic liver damage, nitrofurantoin