23077
Perinatal exposure to BDE - 99 causes learning disorders and decreases serum thyroid hormone levels and BDNF gene expression in hippocampus in rat offspring .
 Chemical: BDE - 99; Chemical: thyroid hormone
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: BDE - 99; Chemical: thyroid hormone