3697
The ratio of cimetidine clearance to creatinine clearance ( Rc ) averaged 4 . 8 + / - 2 . 0 , indicating net tubular secretion for cimetidine .
 cimetidine, creatinine, cimetidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 cimetidine, creatinine, cimetidine