14898
We observed additive or synergistic effects of HEP and HCB in groups treated with mixtures of these pesticides .
 Chemical: HEP; Chemical: HCB
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: HEP; Chemical: HCB