22681
The ratio of epithelium was significantly increased by E2 , PCBs and pesticides ( p < 0 . 01 ) .
 Chemical: PCBs
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: PCBs 
Answer:
 Chemical: PCBs