13639
In this study , the potential toxicity of HBCDD was tested in peripubertal rat Leydig cells in vitro during 6h exposure .
 Chemical: HBCDD
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: HBCDD 
Answer:
 Chemical: HBCDD