6104
BACKGROUND : To assess the nature , incidence , and risk factors of retinopathy associated with pegylated interferon and ribavirin combination therapy in chronic hepatitis C patients .
 adverse effect: retinopathy, pegylated interferon; adverse effect: retinopathy, ribavirin
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  retinopathy, pegylated interferon; retinopathy, ribavirin 
Answer:
 adverse effect: retinopathy, pegylated interferon; adverse effect: retinopathy, ribavirin