11456
Subacute oral toxicity of combinations of selected synthetic pyrethroids , piperonyl butoxide , and tetramethrin in rats .
 Chemical: pyrethroids; Chemical: piperonyl butoxide; Chemical: tetramethrin
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: pyrethroids; Chemical: piperonyl butoxide; Chemical: tetramethrin