3421
While the mechanism of dextran - associated renal failure remains unsolved , plasma exchange seems to be effective therapy .
 adverse effect: renal failure, dextran
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:  renal failure, dextran 
Answer:
 adverse effect: renal failure, dextran