11465
It was concluded that although clinical symptoms were not observed , synthetic pyrethroid , synergist , and knockdown agent combinations might cause serious abnormalities when administered in certain doses in mammalians .
 Chemical: pyrethroid
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: pyrethroid