2923
The objective of this study was to determine whether environmentally relevant concentrations of the commonly used insecticide , malathion , would alter predator avoidance behavior in a freshwater gastropod that could translate to increased predation risk .
 Chemical: malathion
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: malathion