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Nine days later the patient ' s creatine kinase had dropped to 1695 U / L and creatinine was 3 . 3 mg / dL .
 creatine, creatinine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 creatine, creatinine