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HBCD , BDE - 47 and TCDD increased serum testosterone levels and the testosterone / estradiol ratio , suggesting a potential involvement of pathways related to sex steroid biosynthesis and / or metabolism .
 Chemical: HBCD; Chemical: BDE - 47; Chemical: TCDD; Chemical: testosterone; Chemical: testosterone; Chemical: estradiol; Chemical: steroid
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: HBCD; Chemical: BDE - 47; Chemical: TCDD; Chemical: testosterone; Chemical: testosterone; Chemical: estradiol; Chemical: steroid