17957
Results were compared with those from earthworms exposed to cadmium nitrate and selenious acid , as positive controls , and those exposed in untreated soil ( negative control ) .
 Chemical: cadmium nitrate; Chemical: selenious acid
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: cadmium nitrate; Chemical: selenious acid