7773
In this study , we investigated the effects of diquat on a widely spread aquatic invertebrate , the holarctic freshwater snail Lymnaea stagnalis .
 Chemical: diquat
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: diquat