1993
Renal damage was identified by histologic observation and the higher of serum blood urea nitrogen ( BUN ) and creatinine .
 Chemical: urea; Chemical: nitrogen; Chemical: creatinine
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: urea; Chemical: nitrogen; Chemical: creatinine