13895
While the introduction of carmustine wafers ( Gliadel wafers ) into the tumor resection cavity has been shown to be a beneficial therapy for malignant glioma , it is recognized that clinically significant cerebral edema is a potential adverse effect .
 adverse effect: cerebral edema, carmustine; adverse effect: cerebral edema, Gliadel
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:  cerebral edema, carmustine; cerebral edema, Gliadel 
Answer:
 adverse effect: cerebral edema, carmustine; adverse effect: cerebral edema, Gliadel