23688
Elevated levels were found for blood lead , serum creatinine , and serum urea nitrogen in the mining area with mean values at 245 . 65 mu g / l , 74 . 16 mu mol / l , and 12 . 79 mmol / l , which were significantly higher than those in the control area , respectively .
 Chemical: creatinine; Chemical: urea; Chemical: nitrogen
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: creatinine; Chemical: urea; Chemical: nitrogen