18489
Stable oscillation zoo - phytobenthos systems were produced at diatom exposures of 0 , 100 , and 150 micro g / L atrazine .
 Chemical: atrazine
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: atrazine