3555
Results of the present study suggest that , although breastfeeding increases children ' s blood persistent organic pollutants ( POPs ) levels during postnatal life , deleterious effects of PCB - 153 on neuropsychological development are mainly attributable to prenatal exposure .
 Chemical: PCB - 153
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: PCB - 153