4308
INTERPRETATION : Repeated exposure of human beings to HCFCs 123 and 124 can result in serious liver injury in a large proportion of the exposed population .
 HCFCs 123 and 124, liver injury
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 HCFCs 123 and 124, liver injury