2623
Chlorambucil central nervous toxicity : a significant side effect of chlorambucil therapy in childhood nephrotic syndrome .
 adverse effect: central nervous toxicity, Chlorambucil
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 adverse effect: central nervous toxicity, Chlorambucil