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The main goal of the present study was to examine the neurobehavioral changes in rat offspring that were perinatally exposed to one of the most prevalent PBDEs congeners found in humans , 2 , 2 ' , 4 , 4 ' , 5 - pentaBDE ( BDE - 99 ) .
 Chemical: PBDEs; Chemical: 2 , 2 ' , 4 , 4 ' , 5 - pentaBDE; Chemical: BDE - 99
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PBDEs; Chemical: 2 , 2 ' , 4 , 4 ' , 5 - pentaBDE; Chemical: BDE - 99