9231
To this end , rats were treated with a subtoxic dosage of the experimental nephrotoxin uranyl nitrate ( UN ) in the drinking water for 21 weeks , or plain water ( as control ) , and then with low - dose gentamicin for 7 days .
 Chemical: nitrate; Chemical: gentamicin
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: nitrate; Chemical: gentamicin