963
INTRODUCTION : In resource limited settings patients on antiretroviral treatment who develop stavudine induced hyperlactatemia are often switched to zidovudine on the basis of published studies that demonstrate that this agent can be a safe alternative .
 adverse effect: hyperlactatemia, stavudine
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:  hyperlactatemia, stavudine 
Answer:
 adverse effect: hyperlactatemia, stavudine